22121109 has 6 divisors (see below), whose sum is σ = 31952726. Its totient is φ = 14747400.

The previous prime is 22121089. The next prime is 22121137. The reversal of 22121109 is 90112122.

It can be written as a sum of positive squares in only one way, i.e., 16990884 + 5130225 = 4122^2 + 2265^2 .

It is not a de Polignac number, because 22121109 - 2¹² = 22117013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22121091 and 22121100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121159) 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 5 ways as a sum of consecutive naturals, for example, 1228942 + ... + 1228959.

Almost surely, 2^22121109 is an apocalyptic number.

It is an amenable number.

22121109 is a deficient number, since it is larger than the sum of its proper divisors (9831617).

22121109 is a wasteful number, since it uses less digits than its factorization.

22121109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2457907 (or 2457904 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 22121109 is about 4703.3083037368. The cubic root of 22121109 is about 280.7171624180.

It can be divided in two parts, 2212 and 1109, that added together give a triangular number (3321 = T₈₁).

The spelling of 22121109 in words is "twenty-two million, one hundred twenty-one thousand, one hundred nine".