13221910 has 64 divisors (see below), whose sum is σ = 27760320. Its totient is φ = 4492800.

The previous prime is 13221881. The next prime is 13221911. The reversal of 13221910 is 1912231.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13221911) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 130860 + ... + 130960.

It is an arithmetic number, because the mean of its divisors is an integer number (433755).

Almost surely, 2^13221910 is an apocalyptic number.

13221910 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13221910 is an abundant number, since it is smaller than the sum of its proper divisors (14538410).

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

13221910 is a wasteful number, since it uses less digits than its factorization.

13221910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 13221910 is about 3636.1944392455. The cubic root of 13221910 is about 236.4638368871.

The spelling of 13221910 in words is "thirteen million, two hundred twenty-one thousand, nine hundred ten".