401333021 has 2 divisors, whose sum is σ = 401333022. Its totient is φ = 401333020.

The previous prime is 401333017. The next prime is 401333027. The reversal of 401333021 is 120333104.

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., 255648121 + 145684900 = 15989^2 + 12070^2 .

It is a cyclic number.

It is not a de Polignac number, because 401333021 - 2² = 401333017 is a prime.

It is a super-2 number, since 2×401333021² = 322136387489972882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401333027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200666510 + 200666511.

It is an arithmetic number, because the mean of its divisors is an integer number (200666511).

Almost surely, 2^401333021 is an apocalyptic number.

It is an amenable number.

401333021 is a deficient number, since it is larger than the sum of its proper divisors (1).

401333021 is an equidigital number, since it uses as much as digits as its factorization.

401333021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 401333021 is about 20033.2978064022. The cubic root of 401333021 is about 737.6238740884.

Adding to 401333021 its reverse (120333104), we get a palindrome (521666125).

The spelling of 401333021 in words is "four hundred one million, three hundred thirty-three thousand, twenty-one".