401750221 has 2 divisors, whose sum is σ = 401750222. Its totient is φ = 401750220.

The previous prime is 401750201. The next prime is 401750243. The reversal of 401750221 is 122057104.

It is a happy number.

It is an a-pointer prime, because the next prime (401750243) can be obtained adding 401750221 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 228432996 + 173317225 = 15114^2 + 13165^2 .

It is a cyclic number.

It is not a de Polignac number, because 401750221 - 2⁹ = 401749709 is a prime.

It is a super-2 number, since 2×401750221² = 322806480147097682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 401750192 and 401750201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401750201) 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, 200875110 + 200875111.

It is an arithmetic number, because the mean of its divisors is an integer number (200875111).

Almost surely, 2^401750221 is an apocalyptic number.

It is an amenable number.

401750221 is a deficient number, since it is larger than the sum of its proper divisors (1).

401750221 is an equidigital number, since it uses as much as digits as its factorization.

401750221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 401750221 is about 20043.7077657803. The cubic root of 401750221 is about 737.8793810210.

The spelling of 401750221 in words is "four hundred one million, seven hundred fifty thousand, two hundred twenty-one".