2143121650 has 12 divisors (see below), whose sum is σ = 3986206362. Its totient is φ = 857248640.

The previous prime is 2143121647. The next prime is 2143121699. The reversal of 2143121650 is 561213412.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 2010894649 + 132227001 = 44843^2 + 11499^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21431167 + ... + 21431266.

Almost surely, 2^2143121650 is an apocalyptic number.

2143121650 is a deficient number, since it is larger than the sum of its proper divisors (1843084712).

2143121650 is a wasteful number, since it uses less digits than its factorization.

2143121650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42862445 (or 42862440 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 2143121650 is about 46293.8619041445. The cubic root of 2143121650 is about 1289.2850333733.

The spelling of 2143121650 in words is "two billion, one hundred forty-three million, one hundred twenty-one thousand, six hundred fifty".