21132332121 has 4 divisors (see below), whose sum is σ = 28176442832. Its totient is φ = 14088221412.

The previous prime is 21132332101. The next prime is 21132332141. The reversal of 21132332121 is 12123323112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (21132332101) and next prime (21132332141).

It is not a de Polignac number, because 21132332121 - 2⁹ = 21132331609 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21132332101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3522055351 + ... + 3522055356.

It is an arithmetic number, because the mean of its divisors is an integer number (7044110708).

Almost surely, 2^21132332121 is an apocalyptic number.

It is an amenable number.

21132332121 is a deficient number, since it is larger than the sum of its proper divisors (7044110711).

21132332121 is an equidigital number, since it uses as much as digits as its factorization.

21132332121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7044110710.

The product of its digits is 432, while the sum is 21.

Adding to 21132332121 its reverse (12123323112), we get a palindrome (33255655233).

Subtracting from 21132332121 its reverse (12123323112), we obtain a palindrome (9009009009).

The spelling of 21132332121 in words is "twenty-one billion, one hundred thirty-two million, three hundred thirty-two thousand, one hundred twenty-one".