21366242634552 has 16 divisors (see below), whose sum is σ = 53415606586440. Its totient is φ = 7122080878176.

The previous prime is 21366242634547. The next prime is 21366242634559. The reversal of 21366242634552 is 25543624266312.

It is a junction number, because it is equal to n+sod(n) for n = 21366242634495 and 21366242634504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21366242634559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 445130054863 + ... + 445130054910.

Almost surely, 2^{21366242634552} is an apocalyptic number.

It is an amenable number.

21366242634552 is an abundant number, since it is smaller than the sum of its proper divisors (32049363951888).

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

21366242634552 is a wasteful number, since it uses less digits than its factorization.

21366242634552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890260109782 (or 890260109778 counting only the distinct ones).

The product of its digits is 12441600, while the sum is 51.

The spelling of 21366242634552 in words is "twenty-one trillion, three hundred sixty-six billion, two hundred forty-two million, six hundred thirty-four thousand, five hundred fifty-two".