222211997 has 4 divisors (see below), whose sum is σ = 253956576. Its totient is φ = 190467420.

The previous prime is 222211943. The next prime is 222212009. The reversal of 222211997 is 799112222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 222211997 - 2¹⁰ = 222210973 is a prime.

It is a super-2 number, since 2×222211997² = 98756343221456018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222216997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15872279 + ... + 15872292.

It is an arithmetic number, because the mean of its divisors is an integer number (63489144).

Almost surely, 2^222211997 is an apocalyptic number.

It is an amenable number.

222211997 is a deficient number, since it is larger than the sum of its proper divisors (31744579).

222211997 is an equidigital number, since it uses as much as digits as its factorization.

222211997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31744578.

The product of its digits is 9072, while the sum is 35.

The square root of 222211997 is about 14906.7768816737. The cubic root of 222211997 is about 605.6975739040.

The spelling of 222211997 in words is "two hundred twenty-two million, two hundred eleven thousand, nine hundred ninety-seven".