2121199967 has 4 divisors (see below), whose sum is σ = 2152859736. Its totient is φ = 2089540200.

The previous prime is 2121199963. The next prime is 2121199979. The reversal of 2121199967 is 7699911212.

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 2121199967 - 2² = 2121199963 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121199963) 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, 15829784 + ... + 15829917.

It is an arithmetic number, because the mean of its divisors is an integer number (538214934).

Almost surely, 2^2121199967 is an apocalyptic number.

2121199967 is a deficient number, since it is larger than the sum of its proper divisors (31659769).

2121199967 is an equidigital number, since it uses as much as digits as its factorization.

2121199967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31659768.

The product of its digits is 122472, while the sum is 47.

The square root of 2121199967 is about 46056.4866984011. The cubic root of 2121199967 is about 1284.8739886628.

The spelling of 2121199967 in words is "two billion, one hundred twenty-one million, one hundred ninety-nine thousand, nine hundred sixty-seven".