12921822 has 32 divisors (see below), whose sum is σ = 28853760. Its totient is φ = 4286520.

The previous prime is 12921817. The next prime is 12921829. The reversal of 12921822 is 22812921.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12921829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14193 + ... + 15075.

It is an arithmetic number, because the mean of its divisors is an integer number (901680).

Almost surely, 2^12921822 is an apocalyptic number.

12921822 is an abundant number, since it is smaller than the sum of its proper divisors (15931938).

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

12921822 is a wasteful number, since it uses less digits than its factorization.

12921822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1165 (or 1159 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 12921822 is about 3594.6935891672. The cubic root of 12921822 is about 234.6611806605.

The spelling of 12921822 in words is "twelve million, nine hundred twenty-one thousand, eight hundred twenty-two".