21554025053 has 16 divisors (see below), whose sum is σ = 23965787520. Its totient is φ = 19219444800.

The previous prime is 21554025023. The next prime is 21554025137. The reversal of 21554025053 is 35052045512.

It is a cyclic number.

It is not a de Polignac number, because 21554025053 - 2⁸ = 21554024797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21554025013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196151 + ... + 285627.

It is an arithmetic number, because the mean of its divisors is an integer number (1497861720).

Almost surely, 2^21554025053 is an apocalyptic number.

It is an amenable number.

21554025053 is a deficient number, since it is larger than the sum of its proper divisors (2411762467).

21554025053 is a wasteful number, since it uses less digits than its factorization.

21554025053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89908.

The product of its (nonzero) digits is 30000, while the sum is 32.

The spelling of 21554025053 in words is "twenty-one billion, five hundred fifty-four million, twenty-five thousand, fifty-three".