401186021 has 2 divisors, whose sum is σ = 401186022. Its totient is φ = 401186020.

The previous prime is 401186003. The next prime is 401186057. The reversal of 401186021 is 120681104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 391644100 + 9541921 = 19790^2 + 3089^2 .

It is a cyclic number.

It is not a de Polignac number, because 401186021 - 2¹⁸ = 400923877 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401186921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200593010 + 200593011.

It is an arithmetic number, because the mean of its divisors is an integer number (200593011).

Almost surely, 2^401186021 is an apocalyptic number.

It is an amenable number.

401186021 is a deficient number, since it is larger than the sum of its proper divisors (1).

401186021 is an equidigital number, since it uses as much as digits as its factorization.

401186021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 401186021 is about 20029.6285786831. The cubic root of 401186021 is about 737.5338042917.

The spelling of 401186021 in words is "four hundred one million, one hundred eighty-six thousand, twenty-one".