21476570616125 has 8 divisors (see below), whose sum is σ = 26802760129080. Its totient is φ = 17181256492800.

The previous prime is 21476570616121. The next prime is 21476570616133. The reversal of 21476570616125 is 52161607567412.

It can be written as a sum of positive squares in 4 ways, for example, as 1831943301049 + 19644627315076 = 1353493^2 + 4432226^2 .

It is not a de Polignac number, because 21476570616125 - 2² = 21476570616121 is a prime.

It is a super-2 number, since 2×21476570616125² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21476570616121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85906282340 + ... + 85906282589.

It is an arithmetic number, because the mean of its divisors is an integer number (3350345016135).

Almost surely, 2^{21476570616125} is an apocalyptic number.

21476570616125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21476570616125 is a deficient number, since it is larger than the sum of its proper divisors (5326189512955).

21476570616125 is an equidigital number, since it uses as much as digits as its factorization.

21476570616125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171812564944 (or 171812564934 counting only the distinct ones).

The product of its (nonzero) digits is 4233600, while the sum is 53.

The spelling of 21476570616125 in words is "twenty-one trillion, four hundred seventy-six billion, five hundred seventy million, six hundred sixteen thousand, one hundred twenty-five".