21523465125 has 32 divisors (see below), whose sum is σ = 39794501760. Its totient is φ = 11479179600.

The previous prime is 21523465123. The next prime is 21523465127. The reversal of 21523465125 is 52156432512.

21523465125 is a `hidden beast` number, since 2 + 1 + 523 + 4 + 6 + 5 + 125 = 666.

It is an interprime number because it is at equal distance from previous prime (21523465123) and next prime (21523465127).

It is not a de Polignac number, because 21523465125 - 2¹ = 21523465123 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21523465125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21523465123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3185287 + ... + 3192036.

It is an arithmetic number, because the mean of its divisors is an integer number (1243578180).

Almost surely, 2^21523465125 is an apocalyptic number.

21523465125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21523465125 is a deficient number, since it is larger than the sum of its proper divisors (18271036635).

21523465125 is an equidigital number, since it uses as much as digits as its factorization.

21523465125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6377347 (or 6377331 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

Adding to 21523465125 its reverse (52156432512), we get a palindrome (73679897637).

The spelling of 21523465125 in words is "twenty-one billion, five hundred twenty-three million, four hundred sixty-five thousand, one hundred twenty-five".