21230332121 has 4 divisors (see below), whose sum is σ = 21230983632. Its totient is φ = 21229680612.

The previous prime is 21230332117. The next prime is 21230332127. The reversal of 21230332121 is 12123303212.

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 21230332121 - 2² = 21230332117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21230332093 and 21230332102.

It is not an unprimeable number, because it can be changed into a prime (21230332127) 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, 274151 + ... + 342956.

It is an arithmetic number, because the mean of its divisors is an integer number (5307745908).

Almost surely, 2^21230332121 is an apocalyptic number.

It is an amenable number.

21230332121 is a deficient number, since it is larger than the sum of its proper divisors (651511).

21230332121 is an equidigital number, since it uses as much as digits as its factorization.

21230332121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651510.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21230332121 its reverse (12123303212), we get a palindrome (33353635333).

The spelling of 21230332121 in words is "twenty-one billion, two hundred thirty million, three hundred thirty-two thousand, one hundred twenty-one".