1222100205 has 16 divisors (see below), whose sum is σ = 2000834880. Its totient is φ = 636628608.

The previous prime is 1222100189. The next prime is 1222100221. The reversal of 1222100205 is 5020012221.

It is an interprime number because it is at equal distance from previous prime (1222100189) and next prime (1222100221).

It is not a de Polignac number, because 1222100205 - 2⁴ = 1222100189 is a prime.

It is a super-2 number, since 2×1222100205² = 2987057822122084050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 946720 + ... + 948009.

It is an arithmetic number, because the mean of its divisors is an integer number (125052180).

Almost surely, 2^1222100205 is an apocalyptic number.

1222100205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1222100205 is a deficient number, since it is larger than the sum of its proper divisors (778734675).

1222100205 is a wasteful number, since it uses less digits than its factorization.

1222100205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1894780.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 1222100205 is about 34958.5498125995. The cubic root of 1222100205 is about 1069.1425293210.

Adding to 1222100205 its reverse (5020012221), we get a palindrome (6242112426).

The spelling of 1222100205 in words is "one billion, two hundred twenty-two million, one hundred thousand, two hundred five".