125331565021 has 32 divisors (see below), whose sum is σ = 145561167360. Its totient is φ = 106928211456.

The previous prime is 125331565013. The next prime is 125331565027. The reversal of 125331565021 is 120565133521.

It is a cyclic number.

It is not a de Polignac number, because 125331565021 - 2³ = 125331565013 is a prime.

It is a super-2 number, since 2×125331565021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125331565027) 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, 3663025 + ... + 3697081.

It is an arithmetic number, because the mean of its divisors is an integer number (4548786480).

Almost surely, 2^125331565021 is an apocalyptic number.

It is an amenable number.

125331565021 is a deficient number, since it is larger than the sum of its proper divisors (20229602339).

125331565021 is a wasteful number, since it uses less digits than its factorization.

125331565021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34453.

The product of its (nonzero) digits is 27000, while the sum is 34.

Adding to 125331565021 its reverse (120565133521), we get a palindrome (245896698542).

The spelling of 125331565021 in words is "one hundred twenty-five billion, three hundred thirty-one million, five hundred sixty-five thousand, twenty-one".