22051722 has 64 divisors (see below), whose sum is σ = 55987200. Its totient is φ = 5623680.

The previous prime is 22051721. The next prime is 22051739. The reversal of 22051722 is 22715022.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (22051721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26854 + ... + 27662.

It is an arithmetic number, because the mean of its divisors is an integer number (874800).

Almost surely, 2^22051722 is an apocalyptic number.

22051722 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 22051722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27993600).

22051722 is an abundant number, since it is smaller than the sum of its proper divisors (33935478).

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

22051722 is a wasteful number, since it uses less digits than its factorization.

22051722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 22051722 is about 4695.9261067440. The cubic root of 22051722 is about 280.4233476896.

Adding to 22051722 its reverse (22715022), we get a palindrome (44766744).

The spelling of 22051722 in words is "twenty-two million, fifty-one thousand, seven hundred twenty-two".