2121806158 has 4 divisors (see below), whose sum is σ = 3182709240. Its totient is φ = 1060903078.

The previous prime is 2121806149. The next prime is 2121806177. The reversal of 2121806158 is 8516081212.

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

It is a super-2 number, since 2×2121806158² = 9004122744253441928, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 530451538 + ... + 530451541.

It is an arithmetic number, because the mean of its divisors is an integer number (795677310).

Almost surely, 2^2121806158 is an apocalyptic number.

2121806158 is a deficient number, since it is larger than the sum of its proper divisors (1060903082).

2121806158 is a wasteful number, since it uses less digits than its factorization.

2121806158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060903081.

The product of its (nonzero) digits is 7680, while the sum is 34.

The square root of 2121806158 is about 46063.0671796831. The cubic root of 2121806158 is about 1284.9963729856.

The spelling of 2121806158 in words is "two billion, one hundred twenty-one million, eight hundred six thousand, one hundred fifty-eight".