21455132 has 12 divisors (see below), whose sum is σ = 37713480. Its totient is φ = 10679856.

The previous prime is 21455117. The next prime is 21455143. The reversal of 21455132 is 23155412.

It is a junction number, because it is equal to n+sod(n) for n = 21455098 and 21455107.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10907 + ... + 12722.

It is an arithmetic number, because the mean of its divisors is an integer number (3142790).

Almost surely, 2^21455132 is an apocalyptic number.

It is an amenable number.

21455132 is a deficient number, since it is larger than the sum of its proper divisors (16258348).

21455132 is a wasteful number, since it uses less digits than its factorization.

21455132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23860 (or 23858 counting only the distinct ones).

The product of its digits is 1200, while the sum is 23.

The square root of 21455132 is about 4631.9684800309. The cubic root of 21455132 is about 277.8713239185.

The spelling of 21455132 in words is "twenty-one million, four hundred fifty-five thousand, one hundred thirty-two".