1222031100 has 36 divisors (see below), whose sum is σ = 3535744184. Its totient is φ = 325874880.

The previous prime is 1222031089. The next prime is 1222031137. The reversal of 1222031100 is 11302221.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent 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, 2036419 + ... + 2037018.

Almost surely, 2^1222031100 is an apocalyptic number.

1222031100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1222031100 is an abundant number, since it is smaller than the sum of its proper divisors (2313713084).

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

1222031100 is a wasteful number, since it uses less digits than its factorization.

1222031100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4073454 (or 4073447 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1222031100 is about 34957.5614138057. The cubic root of 1222031100 is about 1069.1223769945.

Adding to 1222031100 its reverse (11302221), we get a palindrome (1233333321).

The spelling of 1222031100 in words is "one billion, two hundred twenty-two million, thirty-one thousand, one hundred".