22212240 has 40 divisors (see below), whose sum is σ = 68858688. Its totient is φ = 5923200.

The previous prime is 22212233. The next prime is 22212257. The reversal of 22212240 is 4221222.

22212240 = T₉₇₁ + T₉₇₂ + ... + T₁₀₁₅.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 46036 + ... + 46515.

Almost surely, 2^22212240 is an apocalyptic number.

22212240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22212240 is an abundant number, since it is smaller than the sum of its proper divisors (46646448).

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

22212240 is a wasteful number, since it uses less digits than its factorization.

22212240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92567 (or 92561 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 22212240 is about 4712.9863144295. The cubic root of 22212240 is about 281.1021188009.

Adding to 22212240 its reverse (4221222), we get a palindrome (26433462).

The spelling of 22212240 in words is "twenty-two million, two hundred twelve thousand, two hundred forty".