221020200012120 has 32 divisors (see below), whose sum is σ = 663060600036720. Its totient is φ = 58938720003200.

The previous prime is 221020200011993. The next prime is 221020200012163. The reversal of 221020200012120 is 21210002020122.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 221020200012120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 920917499931 + ... + 920917500170.

Almost surely, 2^{221020200012120} is an apocalyptic number.

221020200012120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221020200012120 is an abundant number, since it is smaller than the sum of its proper divisors (442040400024600).

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

221020200012120 is a wasteful number, since it uses less digits than its factorization.

221020200012120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1841835000115 (or 1841835000111 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 221020200012120 its reverse (21210002020122), we get a palindrome (242230202032242).

The spelling of 221020200012120 in words is "two hundred twenty-one trillion, twenty billion, two hundred million, twelve thousand, one hundred twenty".