2102120990 has 16 divisors (see below), whose sum is σ = 3793551840. Its totient is φ = 838685280.

The previous prime is 2102120989. The next prime is 2102121011. The reversal of 2102120990 is 990212012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 266306 + ... + 274085.

It is an arithmetic number, because the mean of its divisors is an integer number (237096990).

Almost surely, 2^2102120990 is an apocalyptic number.

2102120990 is a deficient number, since it is larger than the sum of its proper divisors (1691430850).

2102120990 is a wasteful number, since it uses less digits than its factorization.

2102120990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540787.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 2102120990 is about 45848.8930073562. The cubic root of 2102120990 is about 1281.0101462099.

The spelling of 2102120990 in words is "two billion, one hundred two million, one hundred twenty thousand, nine hundred ninety".