100421745857827 has 2 divisors, whose sum is σ = 100421745857828. Its totient is φ = 100421745857826.

The previous prime is 100421745857803. The next prime is 100421745857863. The reversal of 100421745857827 is 728758547124001.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 100421745857827 - 2²⁷ = 100421611640099 is a prime.

It is a super-2 number, since 2×100421745857827² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (100421746857827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50210872928913 + 50210872928914.

It is an arithmetic number, because the mean of its divisors is an integer number (50210872928914).

Almost surely, 2^{100421745857827} is an apocalyptic number.

100421745857827 is a deficient number, since it is larger than the sum of its proper divisors (1).

100421745857827 is an equidigital number, since it uses as much as digits as its factorization.

100421745857827 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35123200, while the sum is 61.

The spelling of 100421745857827 in words is "one hundred trillion, four hundred twenty-one billion, seven hundred forty-five million, eight hundred fifty-seven thousand, eight hundred twenty-seven".