21332129 has 16 divisors (see below), whose sum is σ = 26756352. Its totient is φ = 16555968.

The previous prime is 21332119. The next prime is 21332141. The reversal of 21332129 is 92123312.

It is not a de Polignac number, because 21332129 - 2⁸ = 21331873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21332119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2612 + ... + 7034.

It is an arithmetic number, because the mean of its divisors is an integer number (1672272).

Almost surely, 2^21332129 is an apocalyptic number.

It is an amenable number.

21332129 is a deficient number, since it is larger than the sum of its proper divisors (5424223).

21332129 is a wasteful number, since it uses less digits than its factorization.

21332129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4496.

The product of its digits is 648, while the sum is 23.

The square root of 21332129 is about 4618.6717787693. The cubic root of 21332129 is about 277.3392906539.

The spelling of 21332129 in words is "twenty-one million, three hundred thirty-two thousand, one hundred twenty-nine".