21022102121 has 4 divisors (see below), whose sum is σ = 21048024144. Its totient is φ = 20996180100.

The previous prime is 21022102081. The next prime is 21022102133. The reversal of 21022102121 is 12120122012.

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 21022102121 - 2¹⁰ = 21022101097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21022102096 and 21022102105.

It is not an unprimeable number, because it can be changed into a prime (21022102181) 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, 12959795 + ... + 12961416.

It is an arithmetic number, because the mean of its divisors is an integer number (5262006036).

Almost surely, 2^21022102121 is an apocalyptic number.

It is an amenable number.

21022102121 is a deficient number, since it is larger than the sum of its proper divisors (25922023).

21022102121 is an equidigital number, since it uses as much as digits as its factorization.

21022102121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25922022.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21022102121 its reverse (12120122012), we get a palindrome (33142224133).

The spelling of 21022102121 in words is "twenty-one billion, twenty-two million, one hundred two thousand, one hundred twenty-one".