101005621 has 2 divisors, whose sum is σ = 101005622. Its totient is φ = 101005620.

The previous prime is 101005609. The next prime is 101005661. The reversal of 101005621 is 126500101.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93876721 + 7128900 = 9689^2 + 2670^2 .

It is a cyclic number.

It is not a de Polignac number, because 101005621 - 2⁷ = 101005493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 101005595 and 101005604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101005661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50502810 + 50502811.

It is an arithmetic number, because the mean of its divisors is an integer number (50502811).

Almost surely, 2^101005621 is an apocalyptic number.

It is an amenable number.

101005621 is a deficient number, since it is larger than the sum of its proper divisors (1).

101005621 is an equidigital number, since it uses as much as digits as its factorization.

101005621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 101005621 is about 10050.1552724324. The cubic root of 101005621 is about 465.7095899107.

Adding to 101005621 its reverse (126500101), we get a palindrome (227505722).

The spelling of 101005621 in words is "one hundred one million, five thousand, six hundred twenty-one".