401203921 has 2 divisors, whose sum is σ = 401203922. Its totient is φ = 401203920.

The previous prime is 401203897. The next prime is 401203937. The reversal of 401203921 is 129302104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 269780625 + 131423296 = 16425^2 + 11464^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401203921 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 401203892 and 401203901.

It is not a weakly prime, because it can be changed into another prime (401203991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200601960 + 200601961.

It is an arithmetic number, because the mean of its divisors is an integer number (200601961).

Almost surely, 2^401203921 is an apocalyptic number.

It is an amenable number.

401203921 is a deficient number, since it is larger than the sum of its proper divisors (1).

401203921 is an equidigital number, since it uses as much as digits as its factorization.

401203921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 401203921 is about 20030.0754117402. The cubic root of 401203921 is about 737.5447731508.

The spelling of 401203921 in words is "four hundred one million, two hundred three thousand, nine hundred twenty-one".