21190646925 has 120 divisors (see below), whose sum is σ = 46811039616. Its totient is φ = 9265829760.

The previous prime is 21190646921. The next prime is 21190646929. The reversal of 21190646925 is 52964609112.

It is an interprime number because it is at equal distance from previous prime (21190646921) and next prime (21190646929).

It is not a de Polignac number, because 21190646925 - 2² = 21190646921 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21190646921) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 293527 + ... + 358523.

Almost surely, 2^21190646925 is an apocalyptic number.

21190646925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21190646925 is an abundant number, since it is smaller than the sum of its proper divisors (25620392691).

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

21190646925 is a wasteful number, since it uses less digits than its factorization.

21190646925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65049 (or 65035 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 21190646925 in words is "twenty-one billion, one hundred ninety million, six hundred forty-six thousand, nine hundred twenty-five".