21023302121 has 2 divisors, whose sum is σ = 21023302122. Its totient is φ = 21023302120.

The previous prime is 21023301979. The next prime is 21023302123. The reversal of 21023302121 is 12120332012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20506240000 + 517062121 = 143200^2 + 22739^2 .

It is a cyclic number.

It is not a de Polignac number, because 21023302121 - 2³⁰ = 19949560297 is a prime.

Together with 21023302123, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21023302121.

It is not a weakly prime, because it can be changed into another prime (21023302123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511651060 + 10511651061.

It is an arithmetic number, because the mean of its divisors is an integer number (10511651061).

Almost surely, 2^21023302121 is an apocalyptic number.

It is an amenable number.

21023302121 is a deficient number, since it is larger than the sum of its proper divisors (1).

21023302121 is an equidigital number, since it uses as much as digits as its factorization.

21023302121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21023302121 its reverse (12120332012), we get a palindrome (33143634133).

The spelling of 21023302121 in words is "twenty-one billion, twenty-three million, three hundred two thousand, one hundred twenty-one".