22100436 has 36 divisors (see below), whose sum is σ = 57794100. Its totient is φ = 7112448.

The previous prime is 22100431. The next prime is 22100437. The reversal of 22100436 is 63400122.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17690436 + 4410000 = 4206^2 + 2100^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22100431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9541 + ... + 11628.

Almost surely, 2^22100436 is an apocalyptic number.

It is an amenable number.

22100436 is an abundant number, since it is smaller than the sum of its proper divisors (35693664).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22100436 is a wasteful number, since it uses less digits than its factorization.

22100436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21208 (or 21203 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 22100436 is about 4701.1100816722. The cubic root of 22100436 is about 280.6296882830.

Adding to 22100436 its reverse (63400122), we get a palindrome (85500558).

The spelling of 22100436 in words is "twenty-two million, one hundred thousand, four hundred thirty-six".