21221211033331 has 2 divisors, whose sum is σ = 21221211033332. Its totient is φ = 21221211033330.

The previous prime is 21221211033311. The next prime is 21221211033383. The reversal of 21221211033331 is 13333011212212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21221211033331 - 2⁵ = 21221211033299 is a prime.

It is a super-2 number, since 2×21221211033331² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21221211033296 and 21221211033305.

It is not a weakly prime, because it can be changed into another prime (21221211033311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610605516665 + 10610605516666.

It is an arithmetic number, because the mean of its divisors is an integer number (10610605516666).

Almost surely, 2^{21221211033331} is an apocalyptic number.

21221211033331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221211033331 is an equidigital number, since it uses as much as digits as its factorization.

21221211033331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 21221211033331 its reverse (13333011212212), we get a palindrome (34554222245543).

The spelling of 21221211033331 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred eleven million, thirty-three thousand, three hundred thirty-one".