21221674351309 has 2 divisors, whose sum is σ = 21221674351310. Its totient is φ = 21221674351308.

The previous prime is 21221674351277. The next prime is 21221674351331. The reversal of 21221674351309 is 90315347612212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13090177261225 + 8131497090084 = 3618035^2 + 2851578^2 .

It is a cyclic number.

It is not a de Polignac number, because 21221674351309 - 2⁵ = 21221674351277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221674351349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610837175654 + 10610837175655.

It is an arithmetic number, because the mean of its divisors is an integer number (10610837175655).

Almost surely, 2^{21221674351309} is an apocalyptic number.

It is an amenable number.

21221674351309 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221674351309 is an equidigital number, since it uses as much as digits as its factorization.

21221674351309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 46.

The spelling of 21221674351309 in words is "twenty-one trillion, two hundred twenty-one billion, six hundred seventy-four million, three hundred fifty-one thousand, three hundred nine".