21323031121 has 4 divisors (see below), whose sum is σ = 24369178432. Its totient is φ = 18276883812.

The previous prime is 21323031109. The next prime is 21323031127. The reversal of 21323031121 is 12113032312.

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 21323031121 - 2⁹ = 21323030609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21323031127) 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, 1523073645 + ... + 1523073658.

It is an arithmetic number, because the mean of its divisors is an integer number (6092294608).

Almost surely, 2^21323031121 is an apocalyptic number.

It is an amenable number.

21323031121 is a deficient number, since it is larger than the sum of its proper divisors (3046147311).

21323031121 is an equidigital number, since it uses as much as digits as its factorization.

21323031121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3046147310.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21323031121 its reverse (12113032312), we get a palindrome (33436063433).

The spelling of 21323031121 in words is "twenty-one billion, three hundred twenty-three million, thirty-one thousand, one hundred twenty-one".