22121311021 has 2 divisors, whose sum is σ = 22121311022. Its totient is φ = 22121311020.

The previous prime is 22121311019. The next prime is 22121311103. The reversal of 22121311021 is 12011312122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11918088900 + 10203222121 = 109170^2 + 101011^2 .

It is a cyclic number.

It is not a de Polignac number, because 22121311021 - 2¹ = 22121311019 is a prime.

Together with 22121311019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 22121310986 and 22121311004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22121311001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11060655510 + 11060655511.

It is an arithmetic number, because the mean of its divisors is an integer number (11060655511).

Almost surely, 2^22121311021 is an apocalyptic number.

It is an amenable number.

22121311021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22121311021 is an equidigital number, since it uses as much as digits as its factorization.

22121311021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 22121311021 its reverse (12011312122), we get a palindrome (34132623143).

The spelling of 22121311021 in words is "twenty-two billion, one hundred twenty-one million, three hundred eleven thousand, twenty-one".