21146531226125 has 16 divisors (see below), whose sum is σ = 26391732372720. Its totient is φ = 16916672800000.

The previous prime is 21146531226109. The next prime is 21146531226137. The reversal of 21146531226125 is 52162213564112.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 8539848979204 + 12606682246921 = 2922302^2 + 3550589^2 .

It is not a de Polignac number, because 21146531226125 - 2⁴ = 21146531226109 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1105625 + ... + 6596625.

It is an arithmetic number, because the mean of its divisors is an integer number (1649483273295).

Almost surely, 2^{21146531226125} is an apocalyptic number.

21146531226125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21146531226125 is a deficient number, since it is larger than the sum of its proper divisors (5245201146595).

21146531226125 is an equidigital number, since it uses as much as digits as its factorization.

21146531226125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5521825 (or 5521815 counting only the distinct ones).

The product of its digits is 172800, while the sum is 41.

The spelling of 21146531226125 in words is "twenty-one trillion, one hundred forty-six billion, five hundred thirty-one million, two hundred twenty-six thousand, one hundred twenty-five".