221021120210120 has 64 divisors (see below), whose sum is σ = 514485845694000. Its totient is φ = 85353221495808.

The previous prime is 221021120210119. The next prime is 221021120210153. The reversal of 221021120210120 is 21012021120122.

It can be written as a sum of positive squares in 8 ways, for example, as 99874159614436 + 121146960595684 = 9993706^2 + 11006678^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7455674 + ... + 22307606.

Almost surely, 2^{221021120210120} is an apocalyptic number.

221021120210120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221021120210120 is an abundant number, since it is smaller than the sum of its proper divisors (293464725483880).

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

221021120210120 is a wasteful number, since it uses less digits than its factorization.

221021120210120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14864802 (or 14864798 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221021120210120 its reverse (21012021120122), we get a palindrome (242033141330242).

The spelling of 221021120210120 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred twenty million, two hundred ten thousand, one hundred twenty".