21150205464264 has 32 divisors (see below), whose sum is σ = 55985837994720. Its totient is φ = 6635358576896.

The previous prime is 21150205464251. The next prime is 21150205464299. The reversal of 21150205464264 is 46246450205112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25919369034 + ... + 25919369849.

It is an arithmetic number, because the mean of its divisors is an integer number (1749557437335).

Almost surely, 2^{21150205464264} is an apocalyptic number.

21150205464264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21150205464264 is an abundant number, since it is smaller than the sum of its proper divisors (34835632530456).

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

21150205464264 is a wasteful number, since it uses less digits than its factorization.

21150205464264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51838738909 (or 51838738905 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 42.

Adding to 21150205464264 its reverse (46246450205112), we get a palindrome (67396655669376).

The spelling of 21150205464264 in words is "twenty-one trillion, one hundred fifty billion, two hundred five million, four hundred sixty-four thousand, two hundred sixty-four".