21245432533164 has 72 divisors (see below), whose sum is σ = 61380505394208. Its totient is φ = 6069647727360.

The previous prime is 21245432533151. The next prime is 21245432533231. The reversal of 21245432533164 is 46133523454212.

21245432533164 is a `hidden beast` number, since 2 + 1 + 2 + 4 + 5 + 4 + 325 + 3 + 316 + 4 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77337 + ... + 6518960.

It is an arithmetic number, because the mean of its divisors is an integer number (852507019364).

Almost surely, 2^{21245432533164} is an apocalyptic number.

It is an amenable number.

21245432533164 is an abundant number, since it is smaller than the sum of its proper divisors (40135072861044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21245432533164 is a wasteful number, since it uses less digits than its factorization.

21245432533164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6609095 (or 6609090 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 45.

Adding to 21245432533164 its reverse (46133523454212), we get a palindrome (67378955987376).

The spelling of 21245432533164 in words is "twenty-one trillion, two hundred forty-five billion, four hundred thirty-two million, five hundred thirty-three thousand, one hundred sixty-four".