221202211202120 has 16 divisors (see below), whose sum is σ = 497704975204860. Its totient is φ = 88480884480832.

The previous prime is 221202211202111. The next prime is 221202211202143. The reversal of 221202211202120 is 21202112202122.

It can be written as a sum of positive squares in 2 ways, for example, as 199537152080644 + 21665059121476 = 14125762^2 + 4654574^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 221202211202092 and 221202211202101.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2765027639987 + ... + 2765027640066.

Almost surely, 2^{221202211202120} is an apocalyptic number.

221202211202120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221202211202120 is an abundant number, since it is smaller than the sum of its proper divisors (276502764002740).

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

221202211202120 is a wasteful number, since it uses less digits than its factorization.

221202211202120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5530055280064 (or 5530055280060 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 221202211202120 its reverse (21202112202122), we get a palindrome (242404323404242).

The spelling of 221202211202120 in words is "two hundred twenty-one trillion, two hundred two billion, two hundred eleven million, two hundred two thousand, one hundred twenty".