221220021220000 has 120 divisors (see below), whose sum is σ = 593710293540672. Its totient is φ = 80443644000000.

The previous prime is 221220021219949. The next prime is 221220021220013. The reversal of 221220021220000 is 22120022122.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 502552776 + ... + 502992775.

Almost surely, 2^{221220021220000} is an apocalyptic number.

221220021220000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221220021220000 is an abundant number, since it is smaller than the sum of its proper divisors (372490272320672).

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

221220021220000 is a wasteful number, since it uses less digits than its factorization.

221220021220000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005545592 (or 1005545569 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 221220021220000 its reverse (22120022122), we get a palindrome (221242141242122).

The spelling of 221220021220000 in words is "two hundred twenty-one trillion, two hundred twenty billion, twenty-one million, two hundred twenty thousand".