401336021 has 2 divisors, whose sum is σ = 401336022. Its totient is φ = 401336020.

The previous prime is 401335943. The next prime is 401336027. The reversal of 401336021 is 120633104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 303108100 + 98227921 = 17410^2 + 9911^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401336021 is a prime.

It is a super-2 number, since 2×401336021² = 322141203504224882, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 401335984 and 401336002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401336027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200668010 + 200668011.

It is an arithmetic number, because the mean of its divisors is an integer number (200668011).

Almost surely, 2^401336021 is an apocalyptic number.

It is an amenable number.

401336021 is a deficient number, since it is larger than the sum of its proper divisors (1).

401336021 is an equidigital number, since it uses as much as digits as its factorization.

401336021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 401336021 is about 20033.3726816031. The cubic root of 401336021 is about 737.6257120185.

Adding to 401336021 its reverse (120633104), we get a palindrome (521969125).

The spelling of 401336021 in words is "four hundred one million, three hundred thirty-six thousand, twenty-one".