21221101210120 has 64 divisors (see below), whose sum is σ = 55598141214720. Its totient is φ = 7138526763264.

The previous prime is 21221101210117. The next prime is 21221101210201. The reversal of 21221101210120 is 2101210112212.

It is a junction number, because it is equal to n+sod(n) for n = 21221101210094 and 21221101210103.

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, 714981832 + ... + 715011511.

It is an arithmetic number, because the mean of its divisors is an integer number (868720956480).

Almost surely, 2^{21221101210120} is an apocalyptic number.

21221101210120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221101210120 is an abundant number, since it is smaller than the sum of its proper divisors (34377040004600).

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

21221101210120 is a wasteful number, since it uses less digits than its factorization.

21221101210120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1429993414 (or 1429993410 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21221101210120 its reverse (2101210112212), we get a palindrome (23322311322332).

The spelling of 21221101210120 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred one million, two hundred ten thousand, one hundred twenty".