11421720 has 48 divisors (see below), whose sum is σ = 37121760. Its totient is φ = 3045696.

The previous prime is 11421689. The next prime is 11421721. The reversal of 11421720 is 2712411.

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 = 11421693 and 11421702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11421721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15504 + ... + 16223.

It is an arithmetic number, because the mean of its divisors is an integer number (773370).

Almost surely, 2^11421720 is an apocalyptic number.

11421720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11421720 is an abundant number, since it is smaller than the sum of its proper divisors (25700040).

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

11421720 is a wasteful number, since it uses less digits than its factorization.

11421720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31744 (or 31737 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 11421720 is about 3379.6035270428. The cubic root of 11421720 is about 225.2045547171.

The spelling of 11421720 in words is "eleven million, four hundred twenty-one thousand, seven hundred twenty".