21712523362530 has 128 divisors (see below), whose sum is σ = 69965949505536. Its totient is φ = 4164639840000.

The previous prime is 21712523362529. The next prime is 21712523362561. The reversal of 21712523362530 is 3526332521712.

It is a super-2 number, since 2×21712523362530² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 361483846 + ... + 361543905.

It is an arithmetic number, because the mean of its divisors is an integer number (546608980512).

Almost surely, 2^{21712523362530} is an apocalyptic number.

21712523362530 is an abundant number, since it is smaller than the sum of its proper divisors (48253426143006).

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

21712523362530 is a wasteful number, since it uses less digits than its factorization.

21712523362530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723027792.

The product of its (nonzero) digits is 453600, while the sum is 42.

The spelling of 21712523362530 in words is "twenty-one trillion, seven hundred twelve billion, five hundred twenty-three million, three hundred sixty-two thousand, five hundred thirty".