21164614725 has 12 divisors (see below), whose sum is σ = 34992163136. Its totient is φ = 11287794480.

The previous prime is 21164614721. The next prime is 21164614753. The reversal of 21164614725 is 52741646112.

It is not a de Polignac number, because 21164614725 - 2² = 21164614721 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21164614721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 141097357 + ... + 141097506.

Almost surely, 2^21164614725 is an apocalyptic number.

21164614725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21164614725 is a deficient number, since it is larger than the sum of its proper divisors (13827548411).

21164614725 is a wasteful number, since it uses less digits than its factorization.

21164614725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282194876 (or 282194871 counting only the distinct ones).

The product of its digits is 80640, while the sum is 39.

The spelling of 21164614725 in words is "twenty-one billion, one hundred sixty-four million, six hundred fourteen thousand, seven hundred twenty-five".