21623533502225 has 12 divisors (see below), whose sum is σ = 26831189098380. Its totient is φ = 17287209024000.

The previous prime is 21623533502203. The next prime is 21623533502237. The reversal of 21623533502225 is 52220533532612.

It can be written as a sum of positive squares in 6 ways, for example, as 27288727249 + 21596244774976 = 165193^2 + 4647176^2 .

It is not a de Polignac number, because 21623533502225 - 2⁶ = 21623533502161 is a prime.

It is a super-2 number, since 2×21623533502225² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 290406476 + ... + 290480925.

It is an arithmetic number, because the mean of its divisors is an integer number (2235932424865).

Almost surely, 2^{21623533502225} is an apocalyptic number.

21623533502225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21623533502225 is a deficient number, since it is larger than the sum of its proper divisors (5207655596155).

21623533502225 is a wasteful number, since it uses less digits than its factorization.

21623533502225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580888900 (or 580888895 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 41.

The spelling of 21623533502225 in words is "twenty-one trillion, six hundred twenty-three billion, five hundred thirty-three million, five hundred two thousand, two hundred twenty-five".