21054625501 has 32 divisors (see below), whose sum is σ = 26863200000. Its totient is φ = 16050424320.

The previous prime is 21054625469. The next prime is 21054625547. The reversal of 21054625501 is 10552645012.

It is not a de Polignac number, because 21054625501 - 2⁵ = 21054625469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21054605501) 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, 1287625 + ... + 1303873.

It is an arithmetic number, because the mean of its divisors is an integer number (839475000).

Almost surely, 2^21054625501 is an apocalyptic number.

It is an amenable number.

21054625501 is a deficient number, since it is larger than the sum of its proper divisors (5808574499).

21054625501 is a wasteful number, since it uses less digits than its factorization.

21054625501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16789.

The product of its (nonzero) digits is 12000, while the sum is 31.

The spelling of 21054625501 in words is "twenty-one billion, fifty-four million, six hundred twenty-five thousand, five hundred one".