21471077817900 has 54 divisors (see below), whose sum is σ = 67299900585372. Its totient is φ = 5725620751200.

The previous prime is 21471077817821. The next prime is 21471077817929. The reversal of 21471077817900 is 971877017412.

21471077817900 is a `hidden beast` number, since 2 + 1 + 471 + 0 + 7 + 7 + 81 + 7 + 90 + 0 = 666.

It is a super-2 number, since 2×21471077817900² (a number of 27 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 11928375666 + ... + 11928377465.

Almost surely, 2^{21471077817900} is an apocalyptic number.

21471077817900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21471077817900 is an abundant number, since it is smaller than the sum of its proper divisors (45828822767472).

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

21471077817900 is a wasteful number, since it uses less digits than its factorization.

21471077817900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23856753151 (or 23856753141 counting only the distinct ones).

The product of its (nonzero) digits is 1382976, while the sum is 54.

The spelling of 21471077817900 in words is "twenty-one trillion, four hundred seventy-one billion, seventy-seven million, eight hundred seventeen thousand, nine hundred".