1210111998 has 8 divisors (see below), whose sum is σ = 2420224008. Its totient is φ = 403370664.

The previous prime is 1210111997. The next prime is 1210112009. The reversal of 1210111998 is 8991110121.

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

1210111998 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210111997) 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, 100842661 + ... + 100842672.

It is an arithmetic number, because the mean of its divisors is an integer number (302528001).

Almost surely, 2^1210111998 is an apocalyptic number.

1210111998 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1210111998 is a wasteful number, since it uses less digits than its factorization.

1210111998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201685338.

The product of its (nonzero) digits is 1296, while the sum is 33.

The square root of 1210111998 is about 34786.6640826625. The cubic root of 1210111998 is about 1065.6351132507.

The spelling of 1210111998 in words is "one billion, two hundred ten million, one hundred eleven thousand, nine hundred ninety-eight".