136421352391 has 2 divisors, whose sum is σ = 136421352392. Its totient is φ = 136421352390.

The previous prime is 136421352373. The next prime is 136421352461. The reversal of 136421352391 is 193253124631.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 136421352391 - 2⁹ = 136421351879 is a prime.

It is a super-2 number, since 2×136421352391² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136421352311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68210676195 + 68210676196.

It is an arithmetic number, because the mean of its divisors is an integer number (68210676196).

Almost surely, 2^136421352391 is an apocalyptic number.

136421352391 is a deficient number, since it is larger than the sum of its proper divisors (1).

136421352391 is an equidigital number, since it uses as much as digits as its factorization.

136421352391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 40.

The spelling of 136421352391 in words is "one hundred thirty-six billion, four hundred twenty-one million, three hundred fifty-two thousand, three hundred ninety-one".