221012212112120 has 128 divisors (see below), whose sum is σ = 585685677205440. Its totient is φ = 73999050301440.

The previous prime is 221012212112089. The next prime is 221012212112137. The reversal of 221012212112120 is 21211212210122.

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 = 221012212112092 and 221012212112101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46392257 + ... + 50933936.

Almost surely, 2^{221012212112120} is an apocalyptic number.

221012212112120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221012212112120 is an abundant number, since it is smaller than the sum of its proper divisors (364673465093320).

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

221012212112120 is a wasteful number, since it uses less digits than its factorization.

221012212112120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97326625 (or 97326621 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 221012212112120 its reverse (21211212210122), we get a palindrome (242223424322242).

The spelling of 221012212112120 in words is "two hundred twenty-one trillion, twelve billion, two hundred twelve million, one hundred twelve thousand, one hundred twenty".