21132348 has 12 divisors (see below), whose sum is σ = 49308840. Its totient is φ = 7044112.

The previous prime is 21132341. The next prime is 21132383. The reversal of 21132348 is 84323112.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×21132348² = 893152263986208, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21132341) by changing a digit.

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, 880503 + ... + 880526.

It is an arithmetic number, because the mean of its divisors is an integer number (4109070).

Almost surely, 2^21132348 is an apocalyptic number.

It is an amenable number.

21132348 is an abundant number, since it is smaller than the sum of its proper divisors (28176492).

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

21132348 is a wasteful number, since it uses less digits than its factorization.

21132348 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1761036 (or 1761034 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

The square root of 21132348 is about 4596.9933652334. The cubic root of 21132348 is about 276.4707885955.

The spelling of 21132348 in words is "twenty-one million, one hundred thirty-two thousand, three hundred forty-eight".