20212122010021 has 2 divisors, whose sum is σ = 20212122010022. Its totient is φ = 20212122010020.

The previous prime is 20212122009983. The next prime is 20212122010057. The reversal of 20212122010021 is 12001022121202.

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., 20211866969121 + 255040900 = 4495761^2 + 15970^2 .

It is a cyclic number.

It is not a de Polignac number, because 20212122010021 - 2⁹ = 20212122009509 is a prime.

It is a super-2 number, since 2×20212122010021² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20212122009977 and 20212122010004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20212122010921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106061005010 + 10106061005011.

It is an arithmetic number, because the mean of its divisors is an integer number (10106061005011).

Almost surely, 2^{20212122010021} is an apocalyptic number.

It is an amenable number.

20212122010021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212122010021 is an equidigital number, since it uses as much as digits as its factorization.

20212122010021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20212122010021 its reverse (12001022121202), we get a palindrome (32213144131223).

The spelling of 20212122010021 in words is "twenty trillion, two hundred twelve billion, one hundred twenty-two million, ten thousand, twenty-one".