1220100188 has 12 divisors (see below), whose sum is σ = 2136973440. Its totient is φ = 609536352.

The previous prime is 1220100187. The next prime is 1220100221. The reversal of 1220100188 is 8810010221.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220100187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123068 + ... + 132611.

It is an arithmetic number, because the mean of its divisors is an integer number (178081120).

Almost surely, 2^1220100188 is an apocalyptic number.

It is an amenable number.

1220100188 is a deficient number, since it is larger than the sum of its proper divisors (916873252).

1220100188 is a wasteful number, since it uses less digits than its factorization.

1220100188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256876 (or 256874 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 23.

The square root of 1220100188 is about 34929.9325507508. The cubic root of 1220100188 is about 1068.5589790358.

The spelling of 1220100188 in words is "one billion, two hundred twenty million, one hundred thousand, one hundred eighty-eight".