22102021021 has 2 divisors, whose sum is σ = 22102021022. Its totient is φ = 22102021020.

The previous prime is 22102020979. The next prime is 22102021057. The reversal of 22102021021 is 12012020122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14911828996 + 7190192025 = 122114^2 + 84795^2 .

It is a cyclic number.

It is not a de Polignac number, because 22102021021 - 2⁹ = 22102020509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22102020992 and 22102021010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22102021061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11051010510 + 11051010511.

It is an arithmetic number, because the mean of its divisors is an integer number (11051010511).

Almost surely, 2^22102021021 is an apocalyptic number.

It is an amenable number.

22102021021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22102021021 is an equidigital number, since it uses as much as digits as its factorization.

22102021021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 22102021021 its reverse (12012020122), we get a palindrome (34114041143).

The spelling of 22102021021 in words is "twenty-two billion, one hundred two million, twenty-one thousand, twenty-one".