21536552454 has 16 divisors (see below), whose sum is σ = 43079756592. Its totient is φ = 7177742208.

The previous prime is 21536552449. The next prime is 21536552567. The reversal of 21536552454 is 45425563512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234559 + ... + 313194.

It is an arithmetic number, because the mean of its divisors is an integer number (2692484787).

Almost surely, 2^21536552454 is an apocalyptic number.

21536552454 is an abundant number, since it is smaller than the sum of its proper divisors (21543204138).

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

21536552454 is a wasteful number, since it uses less digits than its factorization.

21536552454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554311.

The product of its digits is 720000, while the sum is 42.

The spelling of 21536552454 in words is "twenty-one billion, five hundred thirty-six million, five hundred fifty-two thousand, four hundred fifty-four".