20221312021 has 2 divisors, whose sum is σ = 20221312022. Its totient is φ = 20221312020.

The previous prime is 20221311991. The next prime is 20221312049. The reversal of 20221312021 is 12021312202.

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., 20171100625 + 50211396 = 142025^2 + 7086^2 .

It is a cyclic number.

It is not a de Polignac number, because 20221312021 - 2²³ = 20212923413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20221311986 and 20221312004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20221312061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110656010 + 10110656011.

It is an arithmetic number, because the mean of its divisors is an integer number (10110656011).

Almost surely, 2^20221312021 is an apocalyptic number.

It is an amenable number.

20221312021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20221312021 is an equidigital number, since it uses as much as digits as its factorization.

20221312021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20221312021 its reverse (12021312202), we get a palindrome (32242624223).

The spelling of 20221312021 in words is "twenty billion, two hundred twenty-one million, three hundred twelve thousand, twenty-one".