21427849254 has 24 divisors (see below), whose sum is σ = 49852547928. Its totient is φ = 6122242560.

The previous prime is 21427849231. The next prime is 21427849327. The reversal of 21427849254 is 45294872412.

It is a happy number.

21427849254 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36441627 + ... + 36442214.

It is an arithmetic number, because the mean of its divisors is an integer number (2077189497).

Almost surely, 2^21427849254 is an apocalyptic number.

21427849254 is an abundant number, since it is smaller than the sum of its proper divisors (28424698674).

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

21427849254 is a wasteful number, since it uses less digits than its factorization.

21427849254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72883860 (or 72883853 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 48.

The spelling of 21427849254 in words is "twenty-one billion, four hundred twenty-seven million, eight hundred forty-nine thousand, two hundred fifty-four".