22042121 has 4 divisors (see below), whose sum is σ = 22637892. Its totient is φ = 21446352.

The previous prime is 22042099. The next prime is 22042123. The reversal of 22042121 is 12124022.

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 10725625 + 11316496 = 3275^2 + 3364^2 .

It is a cyclic number.

It is not a de Polignac number, because 22042121 - 2⁶ = 22042057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22042096 and 22042105.

It is not an unprimeable number, because it can be changed into a prime (22042123) 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, 297830 + ... + 297903.

It is an arithmetic number, because the mean of its divisors is an integer number (5659473).

Almost surely, 2^22042121 is an apocalyptic number.

It is an amenable number.

22042121 is a deficient number, since it is larger than the sum of its proper divisors (595771).

22042121 is an equidigital number, since it uses as much as digits as its factorization.

22042121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595770.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 22042121 is about 4694.9037263825. The cubic root of 22042121 is about 280.3826443620.

Adding to 22042121 its reverse (12124022), we get a palindrome (34166143).

The spelling of 22042121 in words is "twenty-two million, forty-two thousand, one hundred twenty-one".