21154467525 has 12 divisors (see below), whose sum is σ = 34975386432. Its totient is φ = 11282382640.

The previous prime is 21154467493. The next prime is 21154467533. The reversal of 21154467525 is 52576445112.

It is not a de Polignac number, because 21154467525 - 2⁵ = 21154467493 is a prime.

It is a super-2 number, since 2×21154467525² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 141029709 + ... + 141029858.

It is an arithmetic number, because the mean of its divisors is an integer number (2914615536).

Almost surely, 2^21154467525 is an apocalyptic number.

21154467525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21154467525 is a deficient number, since it is larger than the sum of its proper divisors (13820918907).

21154467525 is a wasteful number, since it uses less digits than its factorization.

21154467525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282059580 (or 282059575 counting only the distinct ones).

The product of its digits is 336000, while the sum is 42.

The spelling of 21154467525 in words is "twenty-one billion, one hundred fifty-four million, four hundred sixty-seven thousand, five hundred twenty-five".