21632154 has 16 divisors (see below), whose sum is σ = 43316640. Its totient is φ = 7202000.

The previous prime is 21632137. The next prime is 21632179. The reversal of 21632154 is 45123612.

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, 5029 + ... + 8279.

It is an arithmetic number, because the mean of its divisors is an integer number (2707290).

Almost surely, 2^21632154 is an apocalyptic number.

21632154 is an abundant number, since it is smaller than the sum of its proper divisors (21684486).

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

21632154 is a wasteful number, since it uses less digits than its factorization.

21632154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4365.

The product of its digits is 1440, while the sum is 24.

The square root of 21632154 is about 4651.0379486734. The cubic root of 21632154 is about 278.6334519170.

Adding to 21632154 its reverse (45123612), we get a palindrome (66755766).

The spelling of 21632154 in words is "twenty-one million, six hundred thirty-two thousand, one hundred fifty-four".