21051468753408 has 120 divisors (see below), whose sum is σ = 63006185450208. Its totient is φ = 7017156209664.

The previous prime is 21051468753401. The next prime is 21051468753439. The reversal of 21051468753408 is 80435786415012.

It is a happy number.

21051468753408 is a `hidden beast` number, since 2 + 1 + 0 + 514 + 6 + 87 + 5 + 3 + 40 + 8 = 666.

It is a super-2 number, since 2×21051468753408² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (21051468753401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84476716 + ... + 84725547.

Almost surely, 2^{21051468753408} is an apocalyptic number.

It is an amenable number.

21051468753408 is an abundant number, since it is smaller than the sum of its proper divisors (41954716696800).

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

21051468753408 is an frugal number, since it uses more digits than its factorization.

21051468753408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169202296 (or 169202268 counting only the distinct ones).

The product of its (nonzero) digits is 6451200, while the sum is 54.

The spelling of 21051468753408 in words is "twenty-one trillion, fifty-one billion, four hundred sixty-eight million, seven hundred fifty-three thousand, four hundred eight".