21531104254000 has 80 divisors (see below), whose sum is σ = 56795138333856. Its totient is φ = 7829492448000.

The previous prime is 21531104253977. The next prime is 21531104254031. The reversal of 21531104254000 is 45240113512.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 21531104254000.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 489321279 + ... + 489365278.

Almost surely, 2^{21531104254000} is an apocalyptic number.

21531104254000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21531104254000 is an abundant number, since it is smaller than the sum of its proper divisors (35264034079856).

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

21531104254000 is a wasteful number, since it uses less digits than its factorization.

21531104254000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978686591 (or 978686575 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 21531104254000 its reverse (45240113512), we get a palindrome (21576344367512).

The spelling of 21531104254000 in words is "twenty-one trillion, five hundred thirty-one billion, one hundred four million, two hundred fifty-four thousand".