21132039 has 16 divisors (see below), whose sum is σ = 29282400. Its totient is φ = 13539456.

The previous prime is 21132011. The next prime is 21132061. The reversal of 21132039 is 93023112.

It is a happy number.

It is not a de Polignac number, because 21132039 - 2¹⁹ = 20607751 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21132079) 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 15 ways as a sum of consecutive naturals, for example, 25077 + ... + 25905.

It is an arithmetic number, because the mean of its divisors is an integer number (1830150).

Almost surely, 2^21132039 is an apocalyptic number.

21132039 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

21132039 is a deficient number, since it is larger than the sum of its proper divisors (8150361).

21132039 is a wasteful number, since it uses less digits than its factorization.

21132039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1154.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 21132039 is about 4596.9597561867. The cubic root of 21132039 is about 276.4694410581.

The spelling of 21132039 in words is "twenty-one million, one hundred thirty-two thousand, thirty-nine".