21475504404 has 30 divisors (see below), whose sum is σ = 56141211434. Its totient is φ = 7158501360.

The previous prime is 21475504399. The next prime is 21475504537. The reversal of 21475504404 is 40440557412.

21475504404 is a `hidden beast` number, since 2 + 147 + 5 + 504 + 4 + 0 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13731152400 + 7744352004 = 117180^2 + 88002^2 .

It is a super-3 number, since 3×21475504404³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 33140887 + ... + 33141534.

Almost surely, 2^21475504404 is an apocalyptic number.

It is an amenable number.

21475504404 is an abundant number, since it is smaller than the sum of its proper divisors (34665707030).

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

21475504404 is a wasteful number, since it uses less digits than its factorization.

21475504404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66282437 (or 66282426 counting only the distinct ones).

The product of its (nonzero) digits is 89600, while the sum is 36.

The spelling of 21475504404 in words is "twenty-one billion, four hundred seventy-five million, five hundred four thousand, four hundred four".