21020122021231 has 2 divisors, whose sum is σ = 21020122021232. Its totient is φ = 21020122021230.

The previous prime is 21020122021081. The next prime is 21020122021271. The reversal of 21020122021231 is 13212022102012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21020122021231 - 2³¹ = 21017974537583 is a prime.

It is a super-2 number, since 2×21020122021231² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21020122021199 and 21020122021208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21020122021271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510061010615 + 10510061010616.

It is an arithmetic number, because the mean of its divisors is an integer number (10510061010616).

Almost surely, 2^{21020122021231} is an apocalyptic number.

21020122021231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020122021231 is an equidigital number, since it uses as much as digits as its factorization.

21020122021231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21020122021231 its reverse (13212022102012), we get a palindrome (34232144123243).

The spelling of 21020122021231 in words is "twenty-one trillion, twenty billion, one hundred twenty-two million, twenty-one thousand, two hundred thirty-one".