100025621 has 2 divisors, whose sum is σ = 100025622. Its totient is φ = 100025620.

The previous prime is 100025617. The next prime is 100025641. The reversal of 100025621 is 126520001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79459396 + 20566225 = 8914^2 + 4535^2 .

It is a cyclic number.

It is not a de Polignac number, because 100025621 - 2² = 100025617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 100025621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100025641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50012810 + 50012811.

It is an arithmetic number, because the mean of its divisors is an integer number (50012811).

Almost surely, 2^100025621 is an apocalyptic number.

It is an amenable number.

100025621 is a deficient number, since it is larger than the sum of its proper divisors (1).

100025621 is an equidigital number, since it uses as much as digits as its factorization.

100025621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 100025621 is about 10001.2809679561. The cubic root of 100025621 is about 464.1985206921.

Adding to 100025621 its reverse (126520001), we get a palindrome (226545622).

The spelling of 100025621 in words is "one hundred million, twenty-five thousand, six hundred twenty-one".