13212720 has 100 divisors (see below), whose sum is σ = 45912240. Its totient is φ = 3521664.

The previous prime is 13212713. The next prime is 13212743. The reversal of 13212720 is 2721231.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 13212693 and 13212702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5461 + ... + 7499.

Almost surely, 2^13212720 is an apocalyptic number.

13212720 is a gapful number since it is divisible by the number (10) 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 13212720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22956120).

13212720 is an abundant number, since it is smaller than the sum of its proper divisors (32699520).

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

13212720 is a wasteful number, since it uses less digits than its factorization.

13212720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2064 (or 2049 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 13212720 is about 3634.9305357874. The cubic root of 13212720 is about 236.4090387948.

Adding to 13212720 its reverse (2721231), we get a palindrome (15933951).

The spelling of 13212720 in words is "thirteen million, two hundred twelve thousand, seven hundred twenty".