21050888254 has 16 divisors (see below), whose sum is σ = 34961043456. Its totient is φ = 9425770200.

The previous prime is 21050888251. The next prime is 21050888281. The reversal of 21050888254 is 45288805012.

It is a self number, because there is not a number n which added to its sum of digits gives 21050888254.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21050888251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7139262 + ... + 7142209.

It is an arithmetic number, because the mean of its divisors is an integer number (2185065216).

Almost surely, 2^21050888254 is an apocalyptic number.

21050888254 is a deficient number, since it is larger than the sum of its proper divisors (13910155202).

21050888254 is a wasteful number, since it uses less digits than its factorization.

21050888254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14281551.

The product of its (nonzero) digits is 204800, while the sum is 43.

The spelling of 21050888254 in words is "twenty-one billion, fifty million, eight hundred eighty-eight thousand, two hundred fifty-four".