2221220621376 has 63 divisors (see below), whose sum is σ = 6366830384551. Its totient is φ = 740394950784.

The previous prime is 2221220621303. The next prime is 2221220621377. The reversal of 2221220621376 is 6731260221222.

The square root of 2221220621376 is 1490376.

It is a perfect power (a square), and thus also a powerful number.

2221220621376 is a `hidden beast` number, since 2 + 2 + 2 + 1 + 2 + 20 + 621 + 3 + 7 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2221220621376.

It is not an unprimeable number, because it can be changed into a prime (2221220621377) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 35737975 + ... + 35800073.

Almost surely, 2^{2221220621376} is an apocalyptic number.

2221220621376 is the 1490376-th square number.

It is an amenable number.

2221220621376 is an abundant number, since it is smaller than the sum of its proper divisors (4145609763175).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2221220621376 is an frugal number, since it uses more digits than its factorization.

2221220621376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124216 (or 62104 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

Multiplying 2221220621376 by its sum of digits (36), we get a square (79963942369536 = 8942256²).

2221220621376 divided by its sum of digits (36) gives a square (61700572816 = 248396²).

Adding to 2221220621376 its reverse (6731260221222), we get a palindrome (8952480842598).

It can be divided in two parts, 2221220 and 621376, that added together give a square (2842596 = 1686²).

The spelling of 2221220621376 in words is "two trillion, two hundred twenty-one billion, two hundred twenty million, six hundred twenty-one thousand, three hundred seventy-six".