21293154 has 12 divisors (see below), whose sum is σ = 46135206. Its totient is φ = 7097712.

The previous prime is 21293141. The next prime is 21293191. The reversal of 21293154 is 45139212.

It can be written as a sum of positive squares in only one way, i.e., 16769025 + 4524129 = 4095^2 + 2127^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 591459 + ... + 591494.

Almost surely, 2^21293154 is an apocalyptic number.

21293154 is an abundant number, since it is smaller than the sum of its proper divisors (24842052).

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

21293154 is a wasteful number, since it uses less digits than its factorization.

21293154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1182961 (or 1182958 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 21293154 is about 4614.4505631765. The cubic root of 21293154 is about 277.1702828534.

The spelling of 21293154 in words is "twenty-one million, two hundred ninety-three thousand, one hundred fifty-four".