413660021 has 2 divisors, whose sum is σ = 413660022. Its totient is φ = 413660020.

The previous prime is 413660003. The next prime is 413660047. The reversal of 413660021 is 120066314.

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., 316341796 + 97318225 = 17786^2 + 9865^2 .

It is a cyclic number.

It is not a de Polignac number, because 413660021 - 2¹⁰ = 413658997 is a prime.

It is a super-2 number, since 2×413660021² = 342229225947440882, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (413660081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 206830010 + 206830011.

It is an arithmetic number, because the mean of its divisors is an integer number (206830011).

Almost surely, 2^413660021 is an apocalyptic number.

It is an amenable number.

413660021 is a deficient number, since it is larger than the sum of its proper divisors (1).

413660021 is an equidigital number, since it uses as much as digits as its factorization.

413660021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 413660021 is about 20338.6337053402. The cubic root of 413660021 is about 745.0999196342.

The spelling of 413660021 in words is "four hundred thirteen million, six hundred sixty thousand, twenty-one".