21102974712 has 80 divisors (see below), whose sum is σ = 59366399400. Its totient is φ = 7003558080.

The previous prime is 21102974699. The next prime is 21102974713. The reversal of 21102974712 is 21747920112.

It is a super-2 number, since 2×21102974712² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102974713) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 77287 + ... + 219497.

Almost surely, 2^21102974712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21102974712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29683199700).

21102974712 is an abundant number, since it is smaller than the sum of its proper divisors (38263424688).

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

21102974712 is a wasteful number, since it uses less digits than its factorization.

21102974712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142458 (or 142445 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The spelling of 21102974712 in words is "twenty-one billion, one hundred two million, nine hundred seventy-four thousand, seven hundred twelve".