13625354021 has 16 divisors (see below), whose sum is σ = 14566230000. Its totient is φ = 12700474368.

The previous prime is 13625354011. The next prime is 13625354023. The reversal of 13625354021 is 12045352631.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 885717121 + 12739636900 = 29761^2 + 112870^2 .

It is a cyclic number.

It is not a de Polignac number, because 13625354021 - 2¹⁴ = 13625337637 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 (13625354023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 876311 + ... + 891723.

It is an arithmetic number, because the mean of its divisors is an integer number (910389375).

Almost surely, 2^13625354021 is an apocalyptic number.

It is an amenable number.

13625354021 is a deficient number, since it is larger than the sum of its proper divisors (940875979).

13625354021 is a wasteful number, since it uses less digits than its factorization.

13625354021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15928.

The product of its (nonzero) digits is 21600, while the sum is 32.

The spelling of 13625354021 in words is "thirteen billion, six hundred twenty-five million, three hundred fifty-four thousand, twenty-one".