22221772 has 24 divisors (see below), whose sum is σ = 41983200. Its totient is φ = 10260096.

The previous prime is 22221767. The next prime is 22221781. The reversal of 22221772 is 27712222.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1497 + ... + 6832.

It is an arithmetic number, because the mean of its divisors is an integer number (1749300).

Almost surely, 2^22221772 is an apocalyptic number.

It is an amenable number.

22221772 is a deficient number, since it is larger than the sum of its proper divisors (19761428).

22221772 is a wasteful number, since it uses less digits than its factorization.

22221772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8385 (or 8383 counting only the distinct ones).

The product of its digits is 1568, while the sum is 25.

The square root of 22221772 is about 4713.9974543905. The cubic root of 22221772 is about 281.1423230938.

Adding to 22221772 its reverse (27712222), we get a palindrome (49933994).

It can be divided in two parts, 222 and 21772, that multiplied together give a palindrome (4833384).

The spelling of 22221772 in words is "twenty-two million, two hundred twenty-one thousand, seven hundred seventy-two".