21225552513534 has 24 divisors (see below), whose sum is σ = 46026989163792. Its totient is φ = 7069293086400.

The previous prime is 21225552513533. The next prime is 21225552513547. The reversal of 21225552513534 is 43531525552212.

21225552513534 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 55 + 52 + 5 + 13 + 534 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 21225552513534.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21225552513533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 490901514 + ... + 490944749.

It is an arithmetic number, because the mean of its divisors is an integer number (1917791215158).

Almost surely, 2^{21225552513534} is an apocalyptic number.

21225552513534 is an abundant number, since it is smaller than the sum of its proper divisors (24801436650258).

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

21225552513534 is a wasteful number, since it uses less digits than its factorization.

21225552513534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981847472 (or 981847469 counting only the distinct ones).

The product of its digits is 1800000, while the sum is 45.

The spelling of 21225552513534 in words is "twenty-one trillion, two hundred twenty-five billion, five hundred fifty-two million, five hundred thirteen thousand, five hundred thirty-four".