401165021 has 2 divisors, whose sum is σ = 401165022. Its totient is φ = 401165020.

The previous prime is 401164969. The next prime is 401165027. The reversal of 401165021 is 120561104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 207676921 + 193488100 = 14411^2 + 13910^2 .

It is a cyclic number.

It is not a de Polignac number, because 401165021 - 2¹⁸ = 400902877 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 401164984 and 401165002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401165027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200582510 + 200582511.

It is an arithmetic number, because the mean of its divisors is an integer number (200582511).

Almost surely, 2^401165021 is an apocalyptic number.

It is an amenable number.

401165021 is a deficient number, since it is larger than the sum of its proper divisors (1).

401165021 is an equidigital number, since it uses as much as digits as its factorization.

401165021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 401165021 is about 20029.1043484226. The cubic root of 401165021 is about 737.5209353820.

The spelling of 401165021 in words is "four hundred one million, one hundred sixty-five thousand, twenty-one".