21357251132 has 72 divisors (see below), whose sum is σ = 44512216560. Its totient is φ = 8937734400.

The previous prime is 21357251117. The next prime is 21357251143. The reversal of 21357251132 is 23115275312.

It is a super-2 number, since 2×21357251132² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1437719 + ... + 1452497.

It is an arithmetic number, because the mean of its divisors is an integer number (618225230).

Almost surely, 2^21357251132 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 21357251132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22256108280).

21357251132 is an abundant number, since it is smaller than the sum of its proper divisors (23154965428).

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

21357251132 is a wasteful number, since it uses less digits than its factorization.

21357251132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14971 (or 14962 counting only the distinct ones).

The product of its digits is 12600, while the sum is 32.

The spelling of 21357251132 in words is "twenty-one billion, three hundred fifty-seven million, two hundred fifty-one thousand, one hundred thirty-two".