22120999 has 4 divisors (see below), whose sum is σ = 22244760. Its totient is φ = 21997240.

The previous prime is 22120957. The next prime is 22121003. The reversal of 22120999 is 99902122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99902122 = 2 ⋅49951061.

It is a cyclic number.

It is not a de Polignac number, because 22120999 - 2¹¹ = 22118951 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 (22120099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61612 + ... + 61969.

It is an arithmetic number, because the mean of its divisors is an integer number (5561190).

Almost surely, 2^22120999 is an apocalyptic number.

22120999 is a deficient number, since it is larger than the sum of its proper divisors (123761).

22120999 is a wasteful number, since it uses less digits than its factorization.

22120999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123760.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 22120999 is about 4703.2966098259. The cubic root of 22120999 is about 280.7166971168.

The spelling of 22120999 in words is "twenty-two million, one hundred twenty thousand, nine hundred ninety-nine".