21265632708628 has 96 divisors (see below), whose sum is σ = 46719185184000. Its totient is φ = 8227935206400.

The previous prime is 21265632708503. The next prime is 21265632708637. The reversal of 21265632708628 is 82680723656212.

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, 224318598 + ... + 224413378.

It is an arithmetic number, because the mean of its divisors is an integer number (486658179000).

Almost surely, 2^{21265632708628} is an apocalyptic number.

21265632708628 is a gapful number since it is divisible by the number (28) 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 21265632708628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23359592592000).

21265632708628 is an abundant number, since it is smaller than the sum of its proper divisors (25453552475372).

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

21265632708628 is a wasteful number, since it uses less digits than its factorization.

21265632708628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99841 (or 99839 counting only the distinct ones).

The product of its (nonzero) digits is 23224320, while the sum is 58.

The spelling of 21265632708628 in words is "twenty-one trillion, two hundred sixty-five billion, six hundred thirty-two million, seven hundred eight thousand, six hundred twenty-eight".