21253275554 has 32 divisors (see below), whose sum is σ = 37806538752. Its totient is φ = 8768538000.

The previous prime is 21253275551. The next prime is 21253275671. The reversal of 21253275554 is 45557235212.

21253275554 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (21253275551) 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, 45302 + ... + 211089.

It is an arithmetic number, because the mean of its divisors is an integer number (1181454336).

Almost surely, 2^21253275554 is an apocalyptic number.

21253275554 is a deficient number, since it is larger than the sum of its proper divisors (16553263198).

21253275554 is a wasteful number, since it uses less digits than its factorization.

21253275554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256622.

The product of its digits is 420000, while the sum is 41.

The spelling of 21253275554 in words is "twenty-one billion, two hundred fifty-three million, two hundred seventy-five thousand, five hundred fifty-four".