21531430403325 has 36 divisors (see below), whose sum is σ = 39809222447488. Its totient is φ = 11112996333600.

The previous prime is 21531430403303. The next prime is 21531430403363. The reversal of 21531430403325 is 52330403413512.

21531430403325 is a `hidden beast` number, since 2 + 1 + 5 + 3 + 14 + 304 + 0 + 332 + 5 = 666.

It is not a de Polignac number, because 21531430403325 - 2⁸ = 21531430403069 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21531430403325.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1543464739 + ... + 1543478688.

Almost surely, 2^{21531430403325} is an apocalyptic number.

21531430403325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21531430403325 is a deficient number, since it is larger than the sum of its proper divisors (18277792044163).

21531430403325 is a wasteful number, since it uses less digits than its factorization.

21531430403325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3086943474 (or 3086943466 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 36.

Adding to 21531430403325 its reverse (52330403413512), we get a palindrome (73861833816837).

The spelling of 21531430403325 in words is "twenty-one trillion, five hundred thirty-one billion, four hundred thirty million, four hundred three thousand, three hundred twenty-five".