11872421 has 4 divisors (see below), whose sum is σ = 12951744. Its totient is φ = 10793100.

The previous prime is 11872391. The next prime is 11872433. The reversal of 11872421 is 12427811.

11872421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11872421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11872451) 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 3 ways as a sum of consecutive naturals, for example, 539645 + ... + 539666.

It is an arithmetic number, because the mean of its divisors is an integer number (3237936).

Almost surely, 2^11872421 is an apocalyptic number.

11872421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11872421 is a deficient number, since it is larger than the sum of its proper divisors (1079323).

11872421 is a wasteful number, since it uses less digits than its factorization.

11872421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079322.

The product of its digits is 896, while the sum is 26.

The square root of 11872421 is about 3445.6379670534. The cubic root of 11872421 is about 228.1286144670.

The spelling of 11872421 in words is "eleven million, eight hundred seventy-two thousand, four hundred twenty-one".