401230021 has 2 divisors, whose sum is σ = 401230022. Its totient is φ = 401230020.

The previous prime is 401230013. The next prime is 401230043. The reversal of 401230021 is 120032104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 400400100 + 829921 = 20010^2 + 911^2 .

It is a cyclic number.

It is not a de Polignac number, because 401230021 - 2³ = 401230013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 401229983 and 401230010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401230091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200615010 + 200615011.

It is an arithmetic number, because the mean of its divisors is an integer number (200615011).

Almost surely, 2^401230021 is an apocalyptic number.

It is an amenable number.

401230021 is a deficient number, since it is larger than the sum of its proper divisors (1).

401230021 is an equidigital number, since it uses as much as digits as its factorization.

401230021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 401230021 is about 20030.7269214075. The cubic root of 401230021 is about 737.5607662657.

Adding to 401230021 its reverse (120032104), we get a palindrome (521262125).

The spelling of 401230021 in words is "four hundred one million, two hundred thirty thousand, twenty-one".