401222221 has 16 divisors (see below), whose sum is σ = 446227200. Its totient is φ = 359166528.

The previous prime is 401222201. The next prime is 401222233. The reversal of 401222221 is 122222104.

It is a cyclic number.

It is not a de Polignac number, because 401222221 - 2¹³ = 401214029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 401222195 and 401222204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401222201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18151 + ... + 33643.

It is an arithmetic number, because the mean of its divisors is an integer number (27889200).

Almost surely, 2^401222221 is an apocalyptic number.

It is an amenable number.

401222221 is a deficient number, since it is larger than the sum of its proper divisors (45004979).

401222221 is a wasteful number, since it uses less digits than its factorization.

401222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15588.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 401222221 is about 20030.5322195892. The cubic root of 401222221 is about 737.5559867868. Note that the first 3 decimals are identical.

Adding to 401222221 its reverse (122222104), we get a palindrome (523444325).

The spelling of 401222221 in words is "four hundred one million, two hundred twenty-two thousand, two hundred twenty-one".