2121388267 has 4 divisors (see below), whose sum is σ = 2126427616. Its totient is φ = 2116348920.

The previous prime is 2121388259. The next prime is 2121388319. The reversal of 2121388267 is 7628831212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2121388267 - 2³ = 2121388259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121388207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2519043 + ... + 2519884.

It is an arithmetic number, because the mean of its divisors is an integer number (531606904).

Almost surely, 2^2121388267 is an apocalyptic number.

2121388267 is a deficient number, since it is larger than the sum of its proper divisors (5039349).

2121388267 is an equidigital number, since it uses as much as digits as its factorization.

2121388267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5039348.

The product of its digits is 64512, while the sum is 40.

The square root of 2121388267 is about 46058.5308819116. The cubic root of 2121388267 is about 1284.9120071770.

The spelling of 2121388267 in words is "two billion, one hundred twenty-one million, three hundred eighty-eight thousand, two hundred sixty-seven".