221222001 has 96 divisors (see below), whose sum is σ = 412082944. Its totient is φ = 102643200.

The previous prime is 221221967. The next prime is 221222009. The reversal of 221222001 is 100222122.

It is not a de Polignac number, because 221222001 - 2¹⁴ = 221205617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221222009) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1222131 + ... + 1222311.

Almost surely, 2^221222001 is an apocalyptic number.

221222001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221222001 is a deficient number, since it is larger than the sum of its proper divisors (190860943).

221222001 is a wasteful number, since it uses less digits than its factorization.

221222001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263 (or 252 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 221222001 is about 14873.5335747764. The cubic root of 221222001 is about 604.7967361241.

Adding to 221222001 its reverse (100222122), we get a palindrome (321444123).

It can be divided in two parts, 221 and 222001, that added together give a palindrome (222222).

The spelling of 221222001 in words is "two hundred twenty-one million, two hundred twenty-two thousand, one".