21249736397027 has 2 divisors, whose sum is σ = 21249736397028. Its totient is φ = 21249736397026.

The previous prime is 21249736396961. The next prime is 21249736397059. The reversal of 21249736397027 is 72079363794212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21249736397027 - 2³² = 21245441429731 is a prime.

It is not a weakly prime, because it can be changed into another prime (21249736399027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10624868198513 + 10624868198514.

It is an arithmetic number, because the mean of its divisors is an integer number (10624868198514).

Almost surely, 2^{21249736397027} is an apocalyptic number.

21249736397027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21249736397027 is an equidigital number, since it uses as much as digits as its factorization.

21249736397027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48009024, while the sum is 62.

The spelling of 21249736397027 in words is "twenty-one trillion, two hundred forty-nine billion, seven hundred thirty-six million, three hundred ninety-seven thousand, twenty-seven".