22211220 has 48 divisors (see below), whose sum is σ = 63645120. Its totient is φ = 5784576.

The previous prime is 22211219. The next prime is 22211249. The reversal of 22211220 is 2211222.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 22211196 and 22211205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1725 + ... + 6884.

It is an arithmetic number, because the mean of its divisors is an integer number (1325940).

Almost surely, 2^22211220 is an apocalyptic number.

22211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22211220 is an abundant number, since it is smaller than the sum of its proper divisors (41433900).

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

22211220 is a wasteful number, since it uses less digits than its factorization.

22211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8664 (or 8662 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 22211220 is about 4712.8781015426. The cubic root of 22211220 is about 281.0978159398.

Adding to 22211220 its reverse (2211222), we get a palindrome (24422442).

The spelling of 22211220 in words is "twenty-two million, two hundred eleven thousand, two hundred twenty".