21154254 has 32 divisors (see below), whose sum is σ = 46417536. Its totient is φ = 6373920.

The previous prime is 21154207. The next prime is 21154283. The reversal of 21154254 is 45245112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12189 + ... + 13815.

It is an arithmetic number, because the mean of its divisors is an integer number (1450548).

Almost surely, 2^21154254 is an apocalyptic number.

21154254 is an abundant number, since it is smaller than the sum of its proper divisors (25263282).

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

21154254 is a wasteful number, since it uses less digits than its factorization.

21154254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1840.

The product of its digits is 1600, while the sum is 24.

The square root of 21154254 is about 4599.3753923767. The cubic root of 21154254 is about 276.5662863856.

Adding to 21154254 its reverse (45245112), we get a palindrome (66399366).

The spelling of 21154254 in words is "twenty-one million, one hundred fifty-four thousand, two hundred fifty-four".