13211730 has 96 divisors (see below), whose sum is σ = 39970944. Its totient is φ = 2965248.

The previous prime is 13211719. The next prime is 13211741. The reversal of 13211730 is 3711231.

It is an interprime number because it is at equal distance from previous prime (13211719) and next prime (13211741).

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

It is a Curzon number.

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 42054 + ... + 42366.

It is an arithmetic number, because the mean of its divisors is an integer number (416364).

Almost surely, 2^13211730 is an apocalyptic number.

13211730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 13211730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19985472).

13211730 is an abundant number, since it is smaller than the sum of its proper divisors (26759214).

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

13211730 is a wasteful number, since it uses less digits than its factorization.

13211730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400 (or 397 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 18.

The square root of 13211730 is about 3634.7943545681. The cubic root of 13211730 is about 236.4031341112.

Adding to 13211730 its reverse (3711231), we get a palindrome (16922961).

The spelling of 13211730 in words is "thirteen million, two hundred eleven thousand, seven hundred thirty".