10001525621 has 2 divisors, whose sum is σ = 10001525622. Its totient is φ = 10001525620.

The previous prime is 10001525591. The next prime is 10001525623. The reversal of 10001525621 is 12652510001.

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., 7389293521 + 2612232100 = 85961^2 + 51110^2 .

It is a cyclic number.

It is not a de Polignac number, because 10001525621 - 2¹⁸ = 10001263477 is a prime.

Together with 10001525623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10001525623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5000762810 + 5000762811.

It is an arithmetic number, because the mean of its divisors is an integer number (5000762811).

Almost surely, 2^10001525621 is an apocalyptic number.

It is an amenable number.

10001525621 is a deficient number, since it is larger than the sum of its proper divisors (1).

10001525621 is an equidigital number, since it uses as much as digits as its factorization.

10001525621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 600, while the sum is 23.

The spelling of 10001525621 in words is "ten billion, one million, five hundred twenty-five thousand, six hundred twenty-one".