21000104431025 has 12 divisors (see below), whose sum is σ = 26594174804352. Its totient is φ = 16442634957840.

The previous prime is 21000104430983. The next prime is 21000104431049. The reversal of 21000104431025 is 52013440100012.

It is not a de Polignac number, because 21000104431025 - 2¹⁸ = 21000104168881 is a prime.

It is a super-2 number, since 2×21000104431025² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8936213477 + ... + 8936215826.

It is an arithmetic number, because the mean of its divisors is an integer number (2216181233696).

Almost surely, 2^{21000104431025} is an apocalyptic number.

21000104431025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21000104431025 is a deficient number, since it is larger than the sum of its proper divisors (5594070373327).

21000104431025 is a wasteful number, since it uses less digits than its factorization.

21000104431025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17872429360 (or 17872429355 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 21000104431025 its reverse (52013440100012), we get a palindrome (73013544531037).

The spelling of 21000104431025 in words is "twenty-one trillion, one hundred four million, four hundred thirty-one thousand, twenty-five".