21553324224120 has 320 divisors, whose sum is σ = 82121755716000. Its totient is φ = 5026200118272.

The previous prime is 21553324224059. The next prime is 21553324224163. The reversal of 21553324224120 is 2142242335512.

21553324224120 is a `hidden beast` number, since 2 + 1 + 553 + 3 + 2 + 42 + 2 + 41 + 20 = 666.

It is a super-2 number, since 2×21553324224120² (a number of 27 digits) contains 22 as substring.

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 79 ways as a sum of consecutive naturals, for example, 12665835 + ... + 14266394.

Almost surely, 2^{21553324224120} is an apocalyptic number.

21553324224120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21553324224120 is an abundant number, since it is smaller than the sum of its proper divisors (60568431491880).

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

21553324224120 is a wasteful number, since it uses less digits than its factorization.

21553324224120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26932284 (or 26932271 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

Adding to 21553324224120 its reverse (2142242335512), we get a palindrome (23695566559632).

The spelling of 21553324224120 in words is "twenty-one trillion, five hundred fifty-three billion, three hundred twenty-four million, two hundred twenty-four thousand, one hundred twenty".