22107861 has 6 divisors (see below), whose sum is σ = 31933590. Its totient is φ = 14738568.

The previous prime is 22107857. The next prime is 22107863. The reversal of 22107861 is 16870122.

It can be written as a sum of positive squares in only one way, i.e., 20875761 + 1232100 = 4569^2 + 1110^2 .

It is not a de Polignac number, because 22107861 - 2² = 22107857 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22107863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1228206 + ... + 1228223.

It is an arithmetic number, because the mean of its divisors is an integer number (5322265).

Almost surely, 2^22107861 is an apocalyptic number.

It is an amenable number.

22107861 is a deficient number, since it is larger than the sum of its proper divisors (9825729).

22107861 is a wasteful number, since it uses less digits than its factorization.

22107861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2456435 (or 2456432 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 22107861 is about 4701.8997224526. The cubic root of 22107861 is about 280.6611121296.

Adding to 22107861 its reverse (16870122), we get a palindrome (38977983).

The spelling of 22107861 in words is "twenty-two million, one hundred seven thousand, eight hundred sixty-one".