21060672052220 has 24 divisors (see below), whose sum is σ = 44253080222064. Its totient is φ = 8419379504256.

The previous prime is 21060672052187. The next prime is 21060672052237. The reversal of 21060672052220 is 2225027606012.

It is a happy number.

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, 305546969 + ... + 305615888.

It is an arithmetic number, because the mean of its divisors is an integer number (1843878342586).

Almost surely, 2^{21060672052220} is an apocalyptic number.

21060672052220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21060672052220 is an abundant number, since it is smaller than the sum of its proper divisors (23192408169844).

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

21060672052220 is a wasteful number, since it uses less digits than its factorization.

21060672052220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611164589 (or 611164587 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

Adding to 21060672052220 its reverse (2225027606012), we get a palindrome (23285699658232).

The spelling of 21060672052220 in words is "twenty-one trillion, sixty billion, six hundred seventy-two million, fifty-two thousand, two hundred twenty".