401277221 has 2 divisors, whose sum is σ = 401277222. Its totient is φ = 401277220.

The previous prime is 401277193. The next prime is 401277223. The reversal of 401277221 is 122772104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202749121 + 198528100 = 14239^2 + 14090^2 .

It is a cyclic number.

It is not a de Polignac number, because 401277221 - 2⁶ = 401277157 is a prime.

It is a super-2 number, since 2×401277221² = 322046816186965682, which contains 22 as substring.

Together with 401277223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401277223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200638610 + 200638611.

It is an arithmetic number, because the mean of its divisors is an integer number (200638611).

Almost surely, 2^401277221 is an apocalyptic number.

It is an amenable number.

401277221 is a deficient number, since it is larger than the sum of its proper divisors (1).

401277221 is an equidigital number, since it uses as much as digits as its factorization.

401277221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 401277221 is about 20031.9050766521. The cubic root of 401277221 is about 737.5896869191.

The spelling of 401277221 in words is "four hundred one million, two hundred seventy-seven thousand, two hundred twenty-one".