22213906 has 48 divisors (see below), whose sum is σ = 41291712. Its totient is φ = 8886240.

The previous prime is 22213903. The next prime is 22213909. The reversal of 22213906 is 60931222.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (22213903) and next prime (22213909).

It is a Smith number, since the sum of its digits (25) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (22213903) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72205 + ... + 72511.

It is an arithmetic number, because the mean of its divisors is an integer number (860244).

Almost surely, 2^22213906 is an apocalyptic number.

22213906 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

22213906 is a deficient number, since it is larger than the sum of its proper divisors (19077806).

22213906 is a wasteful number, since it uses less digits than its factorization.

22213906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367 (or 356 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 22213906 is about 4713.1630568017. The cubic root of 22213906 is about 281.1091465241.

The spelling of 22213906 in words is "twenty-two million, two hundred thirteen thousand, nine hundred six".