100431391421 has 2 divisors, whose sum is σ = 100431391422. Its totient is φ = 100431391420.

The previous prime is 100431391363. The next prime is 100431391429. The reversal of 100431391421 is 124193134001.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72379831225 + 28051560196 = 269035^2 + 167486^2 .

It is an emirp because it is prime and its reverse (124193134001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100431391421 - 2¹⁸ = 100431129277 is a prime.

It is a super-2 number, since 2×100431391421² (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 (100431391429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50215695710 + 50215695711.

It is an arithmetic number, because the mean of its divisors is an integer number (50215695711).

Almost surely, 2^100431391421 is an apocalyptic number.

It is an amenable number.

100431391421 is a deficient number, since it is larger than the sum of its proper divisors (1).

100431391421 is an equidigital number, since it uses as much as digits as its factorization.

100431391421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The spelling of 100431391421 in words is "one hundred billion, four hundred thirty-one million, three hundred ninety-one thousand, four hundred twenty-one".