2121198516 has 36 divisors (see below), whose sum is σ = 5560510592. Its totient is φ = 707065848.

The previous prime is 2121198481. The next prime is 2121198517. The reversal of 2121198516 is 6158911212.

2121198516 is a `hidden beast` number, since 2 + 121 + 19 + 8 + 516 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121198517) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1090180 + ... + 1092123.

Almost surely, 2^2121198516 is an apocalyptic number.

It is an amenable number.

2121198516 is an abundant number, since it is smaller than the sum of its proper divisors (3439312076).

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

2121198516 is a wasteful number, since it uses less digits than its factorization.

2121198516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2182322 (or 2182308 counting only the distinct ones).

The product of its digits is 8640, while the sum is 36.

The square root of 2121198516 is about 46056.4709460028. The cubic root of 2121198516 is about 1284.8736956914.

The spelling of 2121198516 in words is "two billion, one hundred twenty-one million, one hundred ninety-eight thousand, five hundred sixteen".