22120021 has 12 divisors (see below), whose sum is σ = 28071360. Its totient is φ = 17235960.

The previous prime is 22119989. The next prime is 22120031. The reversal of 22120021 is 12002122.

It is not a de Polignac number, because 22120021 - 2⁵ = 22119989 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 (22120031) 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 11 ways as a sum of consecutive naturals, for example, 19981 + ... + 21058.

It is an arithmetic number, because the mean of its divisors is an integer number (2339280).

Almost surely, 2^22120021 is an apocalyptic number.

It is an amenable number.

22120021 is a deficient number, since it is larger than the sum of its proper divisors (5951339).

22120021 is a wasteful number, since it uses less digits than its factorization.

22120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41064 (or 41057 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 22120021 is about 4703.1926390485. The cubic root of 22120021 is about 280.7125600978.

Adding to 22120021 its reverse (12002122), we get a palindrome (34122143).

It can be divided in two parts, 22 and 120021, that multiplied together give a palindrome (2640462).

The spelling of 22120021 in words is "twenty-two million, one hundred twenty thousand, twenty-one".