401421121 has 2 divisors, whose sum is σ = 401421122. Its totient is φ = 401421120.

The previous prime is 401421109. The next prime is 401421131. The reversal of 401421121 is 121124104.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 362483521 + 38937600 = 19039^2 + 6240^2 .

It is a cyclic number.

It is not a de Polignac number, because 401421121 - 2⁵ = 401421089 is a prime.

It is a super-2 number, since 2×401421121² = 322277832769793282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 401421095 and 401421104.

It is not a weakly prime, because it can be changed into another prime (401421131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200710560 + 200710561.

It is an arithmetic number, because the mean of its divisors is an integer number (200710561).

Almost surely, 2^401421121 is an apocalyptic number.

It is an amenable number.

401421121 is a deficient number, since it is larger than the sum of its proper divisors (1).

401421121 is an equidigital number, since it uses as much as digits as its factorization.

401421121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 401421121 is about 20035.4965249180. The cubic root of 401421121 is about 737.6778441543.

Adding to 401421121 its reverse (121124104), we get a palindrome (522545225).

The spelling of 401421121 in words is "four hundred one million, four hundred twenty-one thousand, one hundred twenty-one".