21140026157 has 2 divisors, whose sum is σ = 21140026158. Its totient is φ = 21140026156.

The previous prime is 21140026147. The next prime is 21140026163. The reversal of 21140026157 is 75162004112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18358624036 + 2781402121 = 135494^2 + 52739^2 .

It is a cyclic number.

It is not a de Polignac number, because 21140026157 - 2⁸ = 21140025901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21140026147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10570013078 + 10570013079.

It is an arithmetic number, because the mean of its divisors is an integer number (10570013079).

Almost surely, 2^21140026157 is an apocalyptic number.

It is an amenable number.

21140026157 is a deficient number, since it is larger than the sum of its proper divisors (1).

21140026157 is an equidigital number, since it uses as much as digits as its factorization.

21140026157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 29.

The spelling of 21140026157 in words is "twenty-one billion, one hundred forty million, twenty-six thousand, one hundred fifty-seven".