21878253358 has 16 divisors (see below), whose sum is σ = 35428221360. Its totient is φ = 10072961856.

The previous prime is 21878253347. The next prime is 21878253403. The reversal of 21878253358 is 85335287812.

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, 1018060 + ... + 1039327.

It is an arithmetic number, because the mean of its divisors is an integer number (2214263835).

Almost surely, 2^21878253358 is an apocalyptic number.

21878253358 is a deficient number, since it is larger than the sum of its proper divisors (13549968002).

21878253358 is a wasteful number, since it uses less digits than its factorization.

21878253358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2057811.

The product of its digits is 3225600, while the sum is 52.

The spelling of 21878253358 in words is "twenty-one billion, eight hundred seventy-eight million, two hundred fifty-three thousand, three hundred fifty-eight".