21234350957 has 8 divisors (see below), whose sum is σ = 21509203320. Its totient is φ = 20960304640.

The previous prime is 21234350911. The next prime is 21234350981. The reversal of 21234350957 is 75905343212.

It can be written as a sum of positive squares in 4 ways, for example, as 182952676 + 21051398281 = 13526^2 + 145091^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21234350957 - 2¹⁴ = 21234334573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234350857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148394 + ... + 253947.

It is an arithmetic number, because the mean of its divisors is an integer number (2688650415).

Almost surely, 2^21234350957 is an apocalyptic number.

It is an amenable number.

21234350957 is a deficient number, since it is larger than the sum of its proper divisors (274852363).

21234350957 is an equidigital number, since it uses as much as digits as its factorization.

21234350957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403023.

The product of its (nonzero) digits is 226800, while the sum is 41.

The spelling of 21234350957 in words is "twenty-one billion, two hundred thirty-four million, three hundred fifty thousand, nine hundred fifty-seven".