21102330121 has 4 divisors (see below), whose sum is σ = 21102792192. Its totient is φ = 21101868052.

The previous prime is 21102330091. The next prime is 21102330133. The reversal of 21102330121 is 12103320112.

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 21102330121 - 2²⁷ = 20968112393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21102330095 and 21102330104.

It is not an unprimeable number, because it can be changed into a prime (21102331121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153961 + ... + 256726.

It is an arithmetic number, because the mean of its divisors is an integer number (5275698048).

Almost surely, 2^21102330121 is an apocalyptic number.

It is an amenable number.

21102330121 is a deficient number, since it is larger than the sum of its proper divisors (462071).

21102330121 is an equidigital number, since it uses as much as digits as its factorization.

21102330121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462070.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21102330121 its reverse (12103320112), we get a palindrome (33205650233).

The spelling of 21102330121 in words is "twenty-one billion, one hundred two million, three hundred thirty thousand, one hundred twenty-one".