21013322120 has 128 divisors (see below), whose sum is σ = 55290470400. Its totient is φ = 7037673216.

The previous prime is 21013322111. The next prime is 21013322129. The reversal of 21013322120 is 2122331012.

It is an interprime number because it is at equal distance from previous prime (21013322111) and next prime (21013322129).

It is not an unprimeable number, because it can be changed into a prime (21013322129) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8671229 + ... + 8673651.

It is an arithmetic number, because the mean of its divisors is an integer number (431956800).

Almost surely, 2^21013322120 is an apocalyptic number.

21013322120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21013322120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27645235200).

21013322120 is an abundant number, since it is smaller than the sum of its proper divisors (34277148280).

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

21013322120 is a wasteful number, since it uses less digits than its factorization.

21013322120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3147 (or 3143 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21013322120 its reverse (2122331012), we get a palindrome (23135653132).

The spelling of 21013322120 in words is "twenty-one billion, thirteen million, three hundred twenty-two thousand, one hundred twenty".