401221243 has 2 divisors, whose sum is σ = 401221244. Its totient is φ = 401221242.

The previous prime is 401221237. The next prime is 401221273. The reversal of 401221243 is 342122104.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 401221243 - 2⁹ = 401220731 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 401221243.

It is not a weakly prime, because it can be changed into another prime (401221273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200610621 + 200610622.

It is an arithmetic number, because the mean of its divisors is an integer number (200610622).

Almost surely, 2^401221243 is an apocalyptic number.

401221243 is a deficient number, since it is larger than the sum of its proper divisors (1).

401221243 is an equidigital number, since it uses as much as digits as its factorization.

401221243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 401221243 is about 20030.5078068430. The cubic root of 401221243 is about 737.5553875093. Note that the first 3 decimals are identical.

Adding to 401221243 its reverse (342122104), we get a palindrome (743343347).

The spelling of 401221243 in words is "four hundred one million, two hundred twenty-one thousand, two hundred forty-three".