11721270 has 48 divisors (see below), whose sum is σ = 30930480. Its totient is φ = 2840640.

The previous prime is 11721263. The next prime is 11721287. The reversal of 11721270 is 7212711.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2016 + ... + 5244.

It is an arithmetic number, because the mean of its divisors is an integer number (644385).

Almost surely, 2^11721270 is an apocalyptic number.

11721270 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 11721270, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15465240).

11721270 is an abundant number, since it is smaller than the sum of its proper divisors (19209210).

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

11721270 is a wasteful number, since it uses less digits than its factorization.

11721270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3261 (or 3250 counting only the distinct ones).

The product of its (nonzero) digits is 196, while the sum is 21.

The square root of 11721270 is about 3423.6340341806. The cubic root of 11721270 is about 227.1563543376.

Adding to 11721270 its reverse (7212711), we get a palindrome (18933981).

It can be divided in two parts, 1172 and 1270, that added together give a palindrome (2442).

The spelling of 11721270 in words is "eleven million, seven hundred twenty-one thousand, two hundred seventy".