21132230021 has 4 divisors (see below), whose sum is σ = 24151120032. Its totient is φ = 18113340012.

The previous prime is 21132229973. The next prime is 21132230047. The reversal of 21132230021 is 12003223112.

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 a cyclic number.

It is not a de Polignac number, because 21132230021 - 2⁶ = 21132229957 is a prime.

It is a super-2 number, since 2×21132230021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21132230051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1509444995 + ... + 1509445008.

It is an arithmetic number, because the mean of its divisors is an integer number (6037780008).

Almost surely, 2^21132230021 is an apocalyptic number.

It is an amenable number.

21132230021 is a deficient number, since it is larger than the sum of its proper divisors (3018890011).

21132230021 is an equidigital number, since it uses as much as digits as its factorization.

21132230021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3018890010.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21132230021 its reverse (12003223112), we get a palindrome (33135453133).

The spelling of 21132230021 in words is "twenty-one billion, one hundred thirty-two million, two hundred thirty thousand, twenty-one".