2121783015 has 32 divisors (see below), whose sum is σ = 3706995456. Its totient is φ = 1027765760.

The previous prime is 2121783007. The next prime is 2121783017. The reversal of 2121783015 is 5103871212.

It is not a de Polignac number, because 2121783015 - 2³ = 2121783007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121783017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 186367 + ... + 197423.

It is an arithmetic number, because the mean of its divisors is an integer number (115843608).

Almost surely, 2^2121783015 is an apocalyptic number.

2121783015 is a deficient number, since it is larger than the sum of its proper divisors (1585212441).

2121783015 is a wasteful number, since it uses less digits than its factorization.

2121783015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12239.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 2121783015 is about 46062.8159690655. The cubic root of 2121783015 is about 1284.9917010572.

The spelling of 2121783015 in words is "two billion, one hundred twenty-one million, seven hundred eighty-three thousand, fifteen".