100231001621 has 2 divisors, whose sum is σ = 100231001622. Its totient is φ = 100231001620.

The previous prime is 100231001617. The next prime is 100231001653. The reversal of 100231001621 is 126100132001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77458682596 + 22772319025 = 278314^2 + 150905^2 .

It is an emirp because it is prime and its reverse (126100132001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100231001621 - 2² = 100231001617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 100231001621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100231001671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50115500810 + 50115500811.

It is an arithmetic number, because the mean of its divisors is an integer number (50115500811).

Almost surely, 2^100231001621 is an apocalyptic number.

It is an amenable number.

100231001621 is a deficient number, since it is larger than the sum of its proper divisors (1).

100231001621 is an equidigital number, since it uses as much as digits as its factorization.

100231001621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 100231001621 its reverse (126100132001), we get a palindrome (226331133622).

The spelling of 100231001621 in words is "one hundred billion, two hundred thirty-one million, one thousand, six hundred twenty-one".