21220126331 has 2 divisors, whose sum is σ = 21220126332. Its totient is φ = 21220126330.

The previous prime is 21220126271. The next prime is 21220126351. The reversal of 21220126331 is 13362102212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21220126331 - 2⁶ = 21220126267 is a prime.

It is a super-2 number, since 2×21220126331² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21220126297 and 21220126306.

It is not a weakly prime, because it can be changed into another prime (21220126351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610063165 + 10610063166.

It is an arithmetic number, because the mean of its divisors is an integer number (10610063166).

Almost surely, 2^21220126331 is an apocalyptic number.

21220126331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220126331 is an equidigital number, since it uses as much as digits as its factorization.

21220126331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21220126331 its reverse (13362102212), we get a palindrome (34582228543).

The spelling of 21220126331 in words is "twenty-one billion, two hundred twenty million, one hundred twenty-six thousand, three hundred thirty-one".