21321344343293 has 2 divisors, whose sum is σ = 21321344343294. Its totient is φ = 21321344343292.

The previous prime is 21321344343251. The next prime is 21321344343319. The reversal of 21321344343293 is 39234344312312.

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., 19337241092569 + 1984103250724 = 4397413^2 + 1408582^2 .

It is a cyclic number.

It is not a de Polignac number, because 21321344343293 - 2²⁶ = 21321277234429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21321344343193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660672171646 + 10660672171647.

It is an arithmetic number, because the mean of its divisors is an integer number (10660672171647).

Almost surely, 2^{21321344343293} is an apocalyptic number.

It is an amenable number.

21321344343293 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321344343293 is an equidigital number, since it uses as much as digits as its factorization.

21321344343293 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1119744, while the sum is 44.

The spelling of 21321344343293 in words is "twenty-one trillion, three hundred twenty-one billion, three hundred forty-four million, three hundred forty-three thousand, two hundred ninety-three".