2121959475 has 18 divisors (see below), whose sum is σ = 3800665596. Its totient is φ = 1131711600.

The previous prime is 2121959471. The next prime is 2121959549. The reversal of 2121959475 is 5749591212.

2121959475 is a `hidden beast` number, since 2 + 121 + 9 + 59 + 475 = 666.

It is not a de Polignac number, because 2121959475 - 2² = 2121959471 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 2121959475.

It is not an unprimeable number, because it can be changed into a prime (2121959471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4715241 + ... + 4715690.

Almost surely, 2^2121959475 is an apocalyptic number.

2121959475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2121959475 is a deficient number, since it is larger than the sum of its proper divisors (1678706121).

2121959475 is a wasteful number, since it uses less digits than its factorization.

2121959475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9430947 (or 9430939 counting only the distinct ones).

The product of its digits is 226800, while the sum is 45.

The square root of 2121959475 is about 46064.7313570805. The cubic root of 2121959475 is about 1285.0273225680.

The spelling of 2121959475 in words is "two billion, one hundred twenty-one million, nine hundred fifty-nine thousand, four hundred seventy-five".