22121730 has 48 divisors (see below), whose sum is σ = 57792384. Its totient is φ = 5870880.

The previous prime is 22121717. The next prime is 22121761. The reversal of 22121730 is 3712122.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23937 + ... + 24843.

It is an arithmetic number, because the mean of its divisors is an integer number (1204008).

Almost surely, 2^22121730 is an apocalyptic number.

22121730 is an abundant number, since it is smaller than the sum of its proper divisors (35670654).

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

22121730 is a wasteful number, since it uses less digits than its factorization.

22121730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1191 (or 1188 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 22121730 is about 4703.3743206341. The cubic root of 22121730 is about 280.7197892262.

Adding to 22121730 its reverse (3712122), we get a palindrome (25833852).

The spelling of 22121730 in words is "twenty-two million, one hundred twenty-one thousand, seven hundred thirty".