2121643732 has 24 divisors (see below), whose sum is σ = 4083561216. Its totient is φ = 958384608.

The previous prime is 2121643723. The next prime is 2121643753. The reversal of 2121643732 is 2373461212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2121643694 and 2121643703.

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, 431608 + ... + 436495.

It is an arithmetic number, because the mean of its divisors is an integer number (170148384).

Almost surely, 2^2121643732 is an apocalyptic number.

It is an amenable number.

2121643732 is a deficient number, since it is larger than the sum of its proper divisors (1961917484).

2121643732 is a wasteful number, since it uses less digits than its factorization.

2121643732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868167 (or 868165 counting only the distinct ones).

The product of its digits is 12096, while the sum is 31.

The square root of 2121643732 is about 46061.3040631722. The cubic root of 2121643732 is about 1284.9635829738.

The spelling of 2121643732 in words is "two billion, one hundred twenty-one million, six hundred forty-three thousand, seven hundred thirty-two".