21768856249558 has 32 divisors (see below), whose sum is σ = 36875360160000. Its totient is φ = 9547181471520.

The previous prime is 21768856249489. The next prime is 21768856249589. The reversal of 21768856249558 is 85594265886712.

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, 10762258 + ... + 12623941.

It is an arithmetic number, because the mean of its divisors is an integer number (1152355005000).

Almost surely, 2^{21768856249558} is an apocalyptic number.

21768856249558 is a deficient number, since it is larger than the sum of its proper divisors (15106503910442).

21768856249558 is a wasteful number, since it uses less digits than its factorization.

21768856249558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23387700.

The product of its digits is 2322432000, while the sum is 76.

The spelling of 21768856249558 in words is "twenty-one trillion, seven hundred sixty-eight billion, eight hundred fifty-six million, two hundred forty-nine thousand, five hundred fifty-eight".