21299997742827 has 16 divisors (see below), whose sum is σ = 29390217660672. Its totient is φ = 13710747454560.

The previous prime is 21299997742813. The next prime is 21299997742889. The reversal of 21299997742827 is 72824779999212.

It is not a de Polignac number, because 21299997742827 - 2⁸ = 21299997742571 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21299997742897) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 732397183 + ... + 732426264.

It is an arithmetic number, because the mean of its divisors is an integer number (1836888603792).

Almost surely, 2^{21299997742827} is an apocalyptic number.

21299997742827 is a deficient number, since it is larger than the sum of its proper divisors (8090219917845).

21299997742827 is a wasteful number, since it uses less digits than its factorization.

21299997742827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1464823618.

The product of its digits is 1152216576, while the sum is 78.

The spelling of 21299997742827 in words is "twenty-one trillion, two hundred ninety-nine billion, nine hundred ninety-seven million, seven hundred forty-two thousand, eight hundred twenty-seven".