21104497454400 has 126 divisors (see below), whose sum is σ = 75010367010462. Its totient is φ = 5627865984000.

The previous prime is 21104497454387. The next prime is 21104497454449. The reversal of 21104497454400 is 445479440112.

21104497454400 is a `hidden beast` number, since 2 + 1 + 10 + 4 + 4 + 97 + 4 + 544 + 0 + 0 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 167503569984 + 20936993884416 = 409272^2 + 4575696^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 732780651 + ... + 732809450.

Almost surely, 2^{21104497454400} is an apocalyptic number.

21104497454400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21104497454400 is an abundant number, since it is smaller than the sum of its proper divisors (53905869556062).

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

21104497454400 is a wasteful number, since it uses less digits than its factorization.

21104497454400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1465590129 (or 1465590111 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 45.

The spelling of 21104497454400 in words is "twenty-one trillion, one hundred four billion, four hundred ninety-seven million, four hundred fifty-four thousand, four hundred".