21013313021220 has 96 divisors (see below), whose sum is σ = 63691528102272. Its totient is φ = 5145707225088.

The previous prime is 21013313021219. The next prime is 21013313021243. The reversal of 21013313021220 is 2212031331012.

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, 69642582 + ... + 69943661.

It is an arithmetic number, because the mean of its divisors is an integer number (663453417732).

Almost surely, 2^{21013313021220} is an apocalyptic number.

21013313021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21013313021220 is an abundant number, since it is smaller than the sum of its proper divisors (42678215081052).

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

21013313021220 is a wasteful number, since it uses less digits than its factorization.

21013313021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139586461 (or 139586459 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21013313021220 its reverse (2212031331012), we get a palindrome (23225344352232).

The spelling of 21013313021220 in words is "twenty-one trillion, thirteen billion, three hundred thirteen million, twenty-one thousand, two hundred twenty".