2167121797 has 4 divisors (see below), whose sum is σ = 2186299980. Its totient is φ = 2147943616.

The previous prime is 2167121771. The next prime is 2167121813. The reversal of 2167121797 is 7971217612.

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

It can be written as a sum of positive squares in 2 ways, for example, as 262148481 + 1904973316 = 16191^2 + 43646^2 .

It is a cyclic number.

It is not a de Polignac number, because 2167121797 - 2⁷ = 2167121669 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 (2167124797) 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, 9588922 + ... + 9589147.

It is an arithmetic number, because the mean of its divisors is an integer number (546574995).

Almost surely, 2^2167121797 is an apocalyptic number.

It is an amenable number.

2167121797 is a deficient number, since it is larger than the sum of its proper divisors (19178183).

2167121797 is a wasteful number, since it uses less digits than its factorization.

2167121797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19178182.

The product of its digits is 74088, while the sum is 43.

The square root of 2167121797 is about 46552.3554398701. The cubic root of 2167121797 is about 1294.0799449663.

The spelling of 2167121797 in words is "two billion, one hundred sixty-seven million, one hundred twenty-one thousand, seven hundred ninety-seven".