22211840 has 144 divisors (see below), whose sum is σ = 63380352. Its totient is φ = 7299072.

The previous prime is 22211807. The next prime is 22211851. The reversal of 22211840 is 4811222.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 331487 + ... + 331553.

Almost surely, 2^22211840 is an apocalyptic number.

22211840 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 22211840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31690176).

22211840 is an abundant number, since it is smaller than the sum of its proper divisors (41168512).

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

22211840 is an equidigital number, since it uses as much as digits as its factorization.

22211840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 118 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 22211840 is about 4712.9438782994. The cubic root of 22211840 is about 281.1004314201.

The spelling of 22211840 in words is "twenty-two million, two hundred eleven thousand, eight hundred forty".