101580385421 has 2 divisors, whose sum is σ = 101580385422. Its totient is φ = 101580385420.

The previous prime is 101580385411. The next prime is 101580385483. The reversal of 101580385421 is 124583085101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59370682921 + 42209702500 = 243661^2 + 205450^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101580385421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101580385411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50790192710 + 50790192711.

It is an arithmetic number, because the mean of its divisors is an integer number (50790192711).

Almost surely, 2^101580385421 is an apocalyptic number.

It is an amenable number.

101580385421 is a deficient number, since it is larger than the sum of its proper divisors (1).

101580385421 is an equidigital number, since it uses as much as digits as its factorization.

101580385421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38400, while the sum is 38.

The spelling of 101580385421 in words is "one hundred one billion, five hundred eighty million, three hundred eighty-five thousand, four hundred twenty-one".