21132999 has 12 divisors (see below), whose sum is σ = 31270512. Its totient is φ = 13744800.

The previous prime is 21132983. The next prime is 21133003. The reversal of 21132999 is 99923112.

It is a happy number.

It is not a de Polignac number, because 21132999 - 2⁴ = 21132983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21132949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28267 + ... + 29004.

It is an arithmetic number, because the mean of its divisors is an integer number (2605876).

Almost surely, 2^21132999 is an apocalyptic number.

21132999 is a deficient number, since it is larger than the sum of its proper divisors (10137513).

21132999 is a wasteful number, since it uses less digits than its factorization.

21132999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57318 (or 57315 counting only the distinct ones).

The product of its digits is 8748, while the sum is 36.

The square root of 21132999 is about 4597.0641718384. The cubic root of 21132999 is about 276.4736275392.

The spelling of 21132999 in words is "twenty-one million, one hundred thirty-two thousand, nine hundred ninety-nine".