21149959254 has 16 divisors (see below), whose sum is σ = 42309896880. Its totient is φ = 7048323360.

The previous prime is 21149959151. The next prime is 21149959283. The reversal of 21149959254 is 45295994112.

It is a junction number, because it is equal to n+sod(n) for n = 21149959197 and 21149959206.

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, 388069 + ... + 439200.

It is an arithmetic number, because the mean of its divisors is an integer number (2644368555).

Almost surely, 2^21149959254 is an apocalyptic number.

21149959254 is an abundant number, since it is smaller than the sum of its proper divisors (21159937626).

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

21149959254 is a wasteful number, since it uses less digits than its factorization.

21149959254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831535.

The product of its digits is 1166400, while the sum is 51.

The spelling of 21149959254 in words is "twenty-one billion, one hundred forty-nine million, nine hundred fifty-nine thousand, two hundred fifty-four".