1812121100123 has 8 divisors (see below), whose sum is σ = 1880010373680. Its totient is φ = 1744591982560.

The previous prime is 1812121100071. The next prime is 1812121100131. The reversal of 1812121100123 is 3210011212181.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1812121100123 - 2²⁶ = 1812053991259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1812121100173) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90028748 + ... + 90048873.

It is an arithmetic number, because the mean of its divisors is an integer number (235001296710).

Almost surely, 2^{1812121100123} is an apocalyptic number.

1812121100123 is a deficient number, since it is larger than the sum of its proper divisors (67889273557).

1812121100123 is a wasteful number, since it uses less digits than its factorization.

1812121100123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180077997.

The product of its (nonzero) digits is 192, while the sum is 23.

The spelling of 1812121100123 in words is "one trillion, eight hundred twelve billion, one hundred twenty-one million, one hundred thousand, one hundred twenty-three".