21045253154 has 16 divisors (see below), whose sum is σ = 33138512640. Its totient is φ = 10010588880.

The previous prime is 21045253133. The next prime is 21045253169. The reversal of 21045253154 is 45135254012.

It is a self number, because there is not a number n which added to its sum of digits gives 21045253154.

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, 2872949 + ... + 2880264.

It is an arithmetic number, because the mean of its divisors is an integer number (2071157040).

Almost surely, 2^21045253154 is an apocalyptic number.

21045253154 is a deficient number, since it is larger than the sum of its proper divisors (12093259486).

21045253154 is a wasteful number, since it uses less digits than its factorization.

21045253154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5753305.

The product of its (nonzero) digits is 24000, while the sum is 32.

The spelling of 21045253154 in words is "twenty-one billion, forty-five million, two hundred fifty-three thousand, one hundred fifty-four".