21336053747 has 2 divisors, whose sum is σ = 21336053748. Its totient is φ = 21336053746.

The previous prime is 21336053731. The next prime is 21336053773. The reversal of 21336053747 is 74735063312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21336053747 - 2⁴ = 21336053731 is a prime.

It is not a weakly prime, because it can be changed into another prime (21336053047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10668026873 + 10668026874.

It is an arithmetic number, because the mean of its divisors is an integer number (10668026874).

Almost surely, 2^21336053747 is an apocalyptic number.

21336053747 is a deficient number, since it is larger than the sum of its proper divisors (1).

21336053747 is an equidigital number, since it uses as much as digits as its factorization.

21336053747 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520, while the sum is 41.

The spelling of 21336053747 in words is "twenty-one billion, three hundred thirty-six million, fifty-three thousand, seven hundred forty-seven".