11421810 has 80 divisors (see below), whose sum is σ = 31363200. Its totient is φ = 2981664.

The previous prime is 11421803. The next prime is 11421859. The reversal of 11421810 is 1812411.

11421810 is a nontrivial binomial coefficient, being equal to C(4780, 2).

It is a super-2 number, since 2×11421810² = 260915487352200, which contains 22 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 47671 + ... + 47909.

It is an arithmetic number, because the mean of its divisors is an integer number (392040).

Almost surely, 2^11421810 is an apocalyptic number.

11421810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11421810 is the 4779-th triangular number and also the 2390-th hexagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11421810, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15681600).

11421810 is an abundant number, since it is smaller than the sum of its proper divisors (19941390).

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

11421810 is a wasteful number, since it uses less digits than its factorization.

11421810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317 (or 308 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 11421810 is about 3379.6168421879. The cubic root of 11421810 is about 225.2051462321.

It can be divided in two parts, 11 and 421810, that added together give a triangular number (421821 = T₉₁₈).

The spelling of 11421810 in words is "eleven million, four hundred twenty-one thousand, eight hundred ten".