21929210393213 has 2 divisors, whose sum is σ = 21929210393214. Its totient is φ = 21929210393212.

The previous prime is 21929210393203. The next prime is 21929210393221. The reversal of 21929210393213 is 31239301292912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21503874249529 + 425336143684 = 4637227^2 + 652178^2 .

It is a cyclic number.

It is not a de Polignac number, because 21929210393213 - 2³⁴ = 21912030524029 is a prime.

It is a super-4 number, since 4×21929210393213⁴ (a number of 54 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21929210393203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10964605196606 + 10964605196607.

It is an arithmetic number, because the mean of its divisors is an integer number (10964605196607).

Almost surely, 2^{21929210393213} is an apocalyptic number.

It is an amenable number.

21929210393213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21929210393213 is an equidigital number, since it uses as much as digits as its factorization.

21929210393213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 314928, while the sum is 47.

The spelling of 21929210393213 in words is "twenty-one trillion, nine hundred twenty-nine billion, two hundred ten million, three hundred ninety-three thousand, two hundred thirteen".