413666021 has 4 divisors (see below), whose sum is σ = 413710752. Its totient is φ = 413621292.

The previous prime is 413665997. The next prime is 413666039. The reversal of 413666021 is 120666314.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 120666314 = 2 ⋅60333157.

It is a cyclic number.

It is not a de Polignac number, because 413666021 - 2¹⁰ = 413664997 is a prime.

It is a super-2 number, since 2×413666021² = 342239153859944882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (413666221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2771 + ... + 28896.

It is an arithmetic number, because the mean of its divisors is an integer number (103427688).

Almost surely, 2^413666021 is an apocalyptic number.

It is an amenable number.

413666021 is a deficient number, since it is larger than the sum of its proper divisors (44731).

413666021 is a wasteful number, since it uses less digits than its factorization.

413666021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44730.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 413666021 is about 20338.7812073389. The cubic root of 413666021 is about 745.1035220917.

The spelling of 413666021 in words is "four hundred thirteen million, six hundred sixty-six thousand, twenty-one".