2121393867 has 4 divisors (see below), whose sum is σ = 2828525160. Its totient is φ = 1414262576.

The previous prime is 2121393839. The next prime is 2121393887. The reversal of 2121393867 is 7683931212.

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 2121393867 - 2⁶ = 2121393803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2121393817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353565642 + ... + 353565647.

It is an arithmetic number, because the mean of its divisors is an integer number (707131290).

Almost surely, 2^2121393867 is an apocalyptic number.

2121393867 is a deficient number, since it is larger than the sum of its proper divisors (707131293).

2121393867 is an equidigital number, since it uses as much as digits as its factorization.

2121393867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707131292.

The product of its digits is 108864, while the sum is 42.

The square root of 2121393867 is about 46058.5916740840. The cubic root of 2121393867 is about 1284.9131378047.

The spelling of 2121393867 in words is "two billion, one hundred twenty-one million, three hundred ninety-three thousand, eight hundred sixty-seven".