21112051260 has 96 divisors (see below), whose sum is σ = 62003450880. Its totient is φ = 5361147648.

The previous prime is 21112051253. The next prime is 21112051277. The reversal of 21112051260 is 6215021112.

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, 3171 + ... + 205509.

It is an arithmetic number, because the mean of its divisors is an integer number (645869280).

Almost surely, 2^21112051260 is an apocalyptic number.

21112051260 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 21112051260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31001725440).

21112051260 is an abundant number, since it is smaller than the sum of its proper divisors (40891399620).

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

21112051260 is a wasteful number, since it uses less digits than its factorization.

21112051260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202435 (or 202433 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 21.

Adding to 21112051260 its reverse (6215021112), we get a palindrome (27327072372).

The spelling of 21112051260 in words is "twenty-one billion, one hundred twelve million, fifty-one thousand, two hundred sixty".