21612630533525 has 6 divisors (see below), whose sum is σ = 26799661861602. Its totient is φ = 17290104426800.

The previous prime is 21612630533497. The next prime is 21612630533561. The reversal of 21612630533525 is 52533503621612.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 892008469444 + 20720622064081 = 944462^2 + 4551991^2 .

It is not a de Polignac number, because 21612630533525 - 2¹⁸ = 21612630271381 is a prime.

It is a super-2 number, since 2×21612630533525² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 432252610646 + ... + 432252610695.

It is an arithmetic number, because the mean of its divisors is an integer number (4466610310267).

Almost surely, 2^{21612630533525} is an apocalyptic number.

21612630533525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21612630533525 is a deficient number, since it is larger than the sum of its proper divisors (5187031328077).

21612630533525 is an equidigital number, since it uses as much as digits as its factorization.

21612630533525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864505221351 (or 864505221346 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 44.

The spelling of 21612630533525 in words is "twenty-one trillion, six hundred twelve billion, six hundred thirty million, five hundred thirty-three thousand, five hundred twenty-five".