21338935261 has 8 divisors (see below), whose sum is σ = 24420905600. Its totient is φ = 18265352688.

The previous prime is 21338935181. The next prime is 21338935307. The reversal of 21338935261 is 16253983312.

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 21338935261 - 2⁷ = 21338935133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21338935061) 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, 2091486 + ... + 2101663.

It is an arithmetic number, because the mean of its divisors is an integer number (3052613200).

Almost surely, 2^21338935261 is an apocalyptic number.

It is an amenable number.

21338935261 is a deficient number, since it is larger than the sum of its proper divisors (3081970339).

21338935261 is an equidigital number, since it uses as much as digits as its factorization.

21338935261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4193883.

The product of its digits is 233280, while the sum is 43.

The spelling of 21338935261 in words is "twenty-one billion, three hundred thirty-eight million, nine hundred thirty-five thousand, two hundred sixty-one".