21031222220329 has 2 divisors, whose sum is σ = 21031222220330. Its totient is φ = 21031222220328.

The previous prime is 21031222220257. The next prime is 21031222220389. The reversal of 21031222220329 is 92302222213012.

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., 17423319515625 + 3607902704704 = 4174125^2 + 1899448^2 .

It is a cyclic number.

It is not a de Polignac number, because 21031222220329 - 2¹⁹ = 21031221696041 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21031222220329.

It is not a weakly prime, because it can be changed into another prime (21031222220389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515611110164 + 10515611110165.

It is an arithmetic number, because the mean of its divisors is an integer number (10515611110165).

Almost surely, 2^{21031222220329} is an apocalyptic number.

It is an amenable number.

21031222220329 is a deficient number, since it is larger than the sum of its proper divisors (1).

21031222220329 is an equidigital number, since it uses as much as digits as its factorization.

21031222220329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 31.

The spelling of 21031222220329 in words is "twenty-one trillion, thirty-one billion, two hundred twenty-two million, two hundred twenty thousand, three hundred twenty-nine".