11997421 has 8 divisors (see below), whose sum is σ = 12562560. Its totient is φ = 11435952.

The previous prime is 11997409. The next prime is 11997437. The reversal of 11997421 is 12479911.

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 11997421 - 2⁹ = 11996909 is a prime.

It is a super-2 number, since 2×11997421² = 287876221302482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11997481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7531 + ... + 8983.

It is an arithmetic number, because the mean of its divisors is an integer number (1570320).

Almost surely, 2^11997421 is an apocalyptic number.

It is an amenable number.

11997421 is a deficient number, since it is larger than the sum of its proper divisors (565139).

11997421 is a wasteful number, since it uses less digits than its factorization.

11997421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1835.

The product of its digits is 4536, while the sum is 34.

The square root of 11997421 is about 3463.7293485490. The cubic root of 11997421 is about 228.9264461243.

The spelling of 11997421 in words is "eleven million, nine hundred ninety-seven thousand, four hundred twenty-one".