21162534246125 has 16 divisors (see below), whose sum is σ = 26644567028976. Its totient is φ = 16780204134400.

The previous prime is 21162534246121. The next prime is 21162534246131. The reversal of 21162534246125 is 52164243526112.

It can be written as a sum of positive squares in 8 ways, for example, as 10126511399524 + 11036022846601 = 3182218^2 + 3322051^2 .

It is not a de Polignac number, because 21162534246125 - 2² = 21162534246121 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 (21162534246121) 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, 749102132 + ... + 749130381.

It is an arithmetic number, because the mean of its divisors is an integer number (1665285439311).

Almost surely, 2^{21162534246125} is an apocalyptic number.

21162534246125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21162534246125 is a deficient number, since it is larger than the sum of its proper divisors (5482032782851).

21162534246125 is a wasteful number, since it uses less digits than its factorization.

21162534246125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498232641 (or 1498232631 counting only the distinct ones).

The product of its digits is 691200, while the sum is 44.

The spelling of 21162534246125 in words is "twenty-one trillion, one hundred sixty-two billion, five hundred thirty-four million, two hundred forty-six thousand, one hundred twenty-five".