2121564772 has 24 divisors (see below), whose sum is σ = 3863293056. Its totient is φ = 1018618848.

The previous prime is 2121564761. The next prime is 2121564791. The reversal of 2121564772 is 2774651212.

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, 96498 + ... + 116425.

It is an arithmetic number, because the mean of its divisors is an integer number (160970544).

Almost surely, 2^2121564772 is an apocalyptic number.

It is an amenable number.

2121564772 is a deficient number, since it is larger than the sum of its proper divisors (1741728284).

2121564772 is a wasteful number, since it uses less digits than its factorization.

2121564772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213027 (or 213025 counting only the distinct ones).

The product of its digits is 47040, while the sum is 37.

The square root of 2121564772 is about 46060.4469366071. The cubic root of 2121564772 is about 1284.9476421914.

The spelling of 2121564772 in words is "two billion, one hundred twenty-one million, five hundred sixty-four thousand, seven hundred seventy-two".