22123681 has 4 divisors (see below), whose sum is σ = 23425092. Its totient is φ = 20822272.

The previous prime is 22123667. The next prime is 22123687. The reversal of 22123681 is 18632122.

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 16072081 + 6051600 = 4009^2 + 2460^2 .

It is a cyclic number.

It is not a de Polignac number, because 22123681 - 2⁵ = 22123649 is a prime.

It is a super-2 number, since 2×22123681² = 978914521979522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22123687) 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, 650680 + ... + 650713.

It is an arithmetic number, because the mean of its divisors is an integer number (5856273).

Almost surely, 2^22123681 is an apocalyptic number.

It is an amenable number.

22123681 is a deficient number, since it is larger than the sum of its proper divisors (1301411).

22123681 is a wasteful number, since it uses less digits than its factorization.

22123681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301410.

The product of its digits is 1152, while the sum is 25.

The square root of 22123681 is about 4703.5817203489. The cubic root of 22123681 is about 280.7280415676.

The spelling of 22123681 in words is "twenty-two million, one hundred twenty-three thousand, six hundred eighty-one".