21102022121 has 4 divisors (see below), whose sum is σ = 21782732544. Its totient is φ = 20421311700.

The previous prime is 21102022111. The next prime is 21102022127. The reversal of 21102022121 is 12122020112.

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 21102022121 - 2¹⁰ = 21102021097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21102022096 and 21102022105.

It is not an unprimeable number, because it can be changed into a prime (21102022127) 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, 340355165 + ... + 340355226.

It is an arithmetic number, because the mean of its divisors is an integer number (5445683136).

Almost surely, 2^21102022121 is an apocalyptic number.

It is an amenable number.

21102022121 is a deficient number, since it is larger than the sum of its proper divisors (680710423).

21102022121 is an equidigital number, since it uses as much as digits as its factorization.

21102022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680710422.

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

Adding to 21102022121 its reverse (12122020112), we get a palindrome (33224042233).

The spelling of 21102022121 in words is "twenty-one billion, one hundred two million, twenty-two thousand, one hundred twenty-one".