2121120987 has 8 divisors (see below), whose sum is σ = 2925684240. Its totient is φ = 1365319200.

The previous prime is 2121120979. The next prime is 2121120997. The reversal of 2121120987 is 7890211212.

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

It is not a de Polignac number, because 2121120987 - 2³ = 2121120979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2121120997) 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, 12190264 + ... + 12190437.

It is an arithmetic number, because the mean of its divisors is an integer number (365710530).

Almost surely, 2^2121120987 is an apocalyptic number.

2121120987 is a deficient number, since it is larger than the sum of its proper divisors (804563253).

2121120987 is a wasteful number, since it uses less digits than its factorization.

2121120987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24380733.

The product of its (nonzero) digits is 4032, while the sum is 33.

The square root of 2121120987 is about 46055.6292650529. The cubic root of 2121120987 is about 1284.8580416188.

The spelling of 2121120987 in words is "two billion, one hundred twenty-one million, one hundred twenty thousand, nine hundred eighty-seven".