2161214686 has 4 divisors (see below), whose sum is σ = 3241822032. Its totient is φ = 1080607342.

The previous prime is 2161214633. The next prime is 2161214687. The reversal of 2161214686 is 6864121612.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161214687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 540303670 + ... + 540303673.

It is an arithmetic number, because the mean of its divisors is an integer number (810455508).

Almost surely, 2^2161214686 is an apocalyptic number.

2161214686 is a deficient number, since it is larger than the sum of its proper divisors (1080607346).

2161214686 is a wasteful number, since it uses less digits than its factorization.

2161214686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080607345.

The product of its digits is 27648, while the sum is 37.

The square root of 2161214686 is about 46488.8662584925. The cubic root of 2161214686 is about 1292.9030798761.

The spelling of 2161214686 in words is "two billion, one hundred sixty-one million, two hundred fourteen thousand, six hundred eighty-six".