22100040 has 160 divisors (see below), whose sum is σ = 78408000. Its totient is φ = 5567616.

The previous prime is 22099999. The next prime is 22100041. The reversal of 22100040 is 4000122.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 22099995 and 22100031.

It is not an unprimeable number, because it can be changed into a prime (22100041) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 61381 + ... + 61739.

It is an arithmetic number, because the mean of its divisors is an integer number (490050).

Almost surely, 2^22100040 is an apocalyptic number.

22100040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22100040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39204000).

22100040 is an abundant number, since it is smaller than the sum of its proper divisors (56307960).

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

22100040 is a wasteful number, since it uses less digits than its factorization.

22100040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401 (or 388 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 22100040 is about 4701.0679637716. The cubic root of 22100040 is about 280.6280121468.

Adding to 22100040 its reverse (4000122), we get a palindrome (26100162).

The spelling of 22100040 in words is "twenty-two million, one hundred thousand, forty".