12401821 has 8 divisors (see below), whose sum is σ = 12902400. Its totient is φ = 11906160.

The previous prime is 12401819. The next prime is 12401827. The reversal of 12401821 is 12810421.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12401821 - 2¹ = 12401819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12401827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4420 + ... + 6658.

It is an arithmetic number, because the mean of its divisors is an integer number (1612800).

Almost surely, 2^12401821 is an apocalyptic number.

It is an amenable number.

12401821 is a deficient number, since it is larger than the sum of its proper divisors (500579).

12401821 is a wasteful number, since it uses less digits than its factorization.

12401821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2459.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 12401821 is about 3521.6219274647. The cubic root of 12401821 is about 231.4702351847.

The spelling of 12401821 in words is "twelve million, four hundred one thousand, eight hundred twenty-one".