1222012100 has 36 divisors (see below), whose sum is σ = 2655496704. Its totient is φ = 488117280.

The previous prime is 1222012091. The next prime is 1222012123. The reversal of 1222012100 is 12102221.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66077 + ... + 82523.

Almost surely, 2^1222012100 is an apocalyptic number.

1222012100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1222012100 is an abundant number, since it is smaller than the sum of its proper divisors (1433484604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1222012100 is a wasteful number, since it uses less digits than its factorization.

1222012100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17204 (or 17197 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1222012100 is about 34957.2896546629. The cubic root of 1222012100 is about 1069.1168361015.

Adding to 1222012100 its reverse (12102221), we get a palindrome (1234114321).

The spelling of 1222012100 in words is "one billion, two hundred twenty-two million, twelve thousand, one hundred".