21254257598 has 16 divisors (see below), whose sum is σ = 36494747520. Its totient is φ = 9094248216.

The previous prime is 21254257579. The next prime is 21254257627. The reversal of 21254257598 is 89575245212.

It is a Curzon number.

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, 1217636 + ... + 1234967.

It is an arithmetic number, because the mean of its divisors is an integer number (2280921720).

Almost surely, 2^21254257598 is an apocalyptic number.

21254257598 is a deficient number, since it is larger than the sum of its proper divisors (15240489922).

21254257598 is a wasteful number, since it uses less digits than its factorization.

21254257598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2453231.

The product of its digits is 2016000, while the sum is 50.

The spelling of 21254257598 in words is "twenty-one billion, two hundred fifty-four million, two hundred fifty-seven thousand, five hundred ninety-eight".