1812121100122 has 32 divisors (see below), whose sum is σ = 2802510018000. Its totient is φ = 878499053568.

The previous prime is 1812121100071. The next prime is 1812121100131. The reversal of 1812121100122 is 2210011212181.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 713756315281 + 1098364784841 = 844841^2 + 1048029^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1812121100093 and 1812121100102.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1680754 + ... + 2539522.

Almost surely, 2^{1812121100122} is an apocalyptic number.

1812121100122 is a deficient number, since it is larger than the sum of its proper divisors (990388917878).

1812121100122 is a wasteful number, since it uses less digits than its factorization.

1812121100122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859090.

The product of its (nonzero) digits is 128, while the sum is 22.

The spelling of 1812121100122 in words is "one trillion, eight hundred twelve billion, one hundred twenty-one million, one hundred thousand, one hundred twenty-two".