21122022222121 has 4 divisors (see below), whose sum is σ = 21202334093952. Its totient is φ = 21041710350292.

The previous prime is 21122022222107. The next prime is 21122022222163. The reversal of 21122022222121 is 12122222022112.

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 21122022222121 - 2³⁵ = 21087662483753 is a prime.

It is a super-2 number, since 2×21122022222121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21122022222092 and 21122022222101.

It is not an unprimeable number, because it can be changed into a prime (21122022222181) 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, 40155935521 + ... + 40155936046.

It is an arithmetic number, because the mean of its divisors is an integer number (5300583523488).

Almost surely, 2^{21122022222121} is an apocalyptic number.

It is an amenable number.

21122022222121 is a deficient number, since it is larger than the sum of its proper divisors (80311871831).

21122022222121 is an equidigital number, since it uses as much as digits as its factorization.

21122022222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80311871830.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21122022222121 its reverse (12122222022112), we get a palindrome (33244244244233).

The spelling of 21122022222121 in words is "twenty-one trillion, one hundred twenty-two billion, twenty-two million, two hundred twenty-two thousand, one hundred twenty-one".