21750772398 has 32 divisors (see below), whose sum is σ = 44264638080. Its totient is φ = 7123633440.

The previous prime is 21750772321. The next prime is 21750772427. The reversal of 21750772398 is 89327705712.

It is a self number, because there is not a number n which added to its sum of digits gives 21750772398.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86833 + ... + 225923.

It is an arithmetic number, because the mean of its divisors is an integer number (1383269940).

Almost surely, 2^21750772398 is an apocalyptic number.

21750772398 is an abundant number, since it is smaller than the sum of its proper divisors (22513865682).

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

21750772398 is a wasteful number, since it uses less digits than its factorization.

21750772398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139552.

The product of its (nonzero) digits is 1481760, while the sum is 51.

The spelling of 21750772398 in words is "twenty-one billion, seven hundred fifty million, seven hundred seventy-two thousand, three hundred ninety-eight".