11421900 has 216 divisors, whose sum is σ = 42879200. Its totient is φ = 2540160.

The previous prime is 11421889. The next prime is 11421901. The reversal of 11421900 is 912411.

It is a super-2 number, since 2×11421900² = 260919599220000, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (11421901) by changing a digit.

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 71 ways as a sum of consecutive naturals, for example, 308682 + ... + 308718.

Almost surely, 2^11421900 is an apocalyptic number.

11421900 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 11421900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21439600).

11421900 is an abundant number, since it is smaller than the sum of its proper divisors (31457300).

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

11421900 is a wasteful number, since it uses less digits than its factorization.

11421900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78 (or 54 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 11421900 is about 3379.6301572805. The cubic root of 11421900 is about 225.2057377441.

It can be divided in two parts, 11421 and 900, that added together give a palindrome (12321).

The spelling of 11421900 in words is "eleven million, four hundred twenty-one thousand, nine hundred".