21513430223325 has 192 divisors, whose sum is σ = 41598851669760. Its totient is φ = 10888141824000.

The previous prime is 21513430223287. The next prime is 21513430223333. The reversal of 21513430223325 is 52332203431512.

21513430223325 is a `hidden beast` number, since 2 + 1 + 5 + 1 + 3 + 4 + 302 + 23 + 325 = 666.

It is not a de Polignac number, because 21513430223325 - 2¹⁰ = 21513430222301 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21513430223325.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 286758519 + ... + 286833531.

It is an arithmetic number, because the mean of its divisors is an integer number (216660685780).

Almost surely, 2^{21513430223325} is an apocalyptic number.

21513430223325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21513430223325 is a deficient number, since it is larger than the sum of its proper divisors (20085421446435).

21513430223325 is a wasteful number, since it uses less digits than its factorization.

21513430223325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75357 (or 75346 counting only the distinct ones).

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

Adding to 21513430223325 its reverse (52332203431512), we get a palindrome (73845633654837).

The spelling of 21513430223325 in words is "twenty-one trillion, five hundred thirteen billion, four hundred thirty million, two hundred twenty-three thousand, three hundred twenty-five".