11897021 has 4 divisors (see below), whose sum is σ = 12523200. Its totient is φ = 11270844.

The previous prime is 11896999. The next prime is 11897051. The reversal of 11897021 is 12079811.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12079811 = 79 ⋅152909.

It is a cyclic number.

It is not a de Polignac number, because 11897021 - 2¹⁰ = 11895997 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 (11897051) 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 3 ways as a sum of consecutive naturals, for example, 313061 + ... + 313098.

It is an arithmetic number, because the mean of its divisors is an integer number (3130800).

Almost surely, 2^11897021 is an apocalyptic number.

It is an amenable number.

11897021 is a deficient number, since it is larger than the sum of its proper divisors (626179).

11897021 is an equidigital number, since it uses as much as digits as its factorization.

11897021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626178.

The product of its (nonzero) digits is 1008, while the sum is 29.

The square root of 11897021 is about 3449.2058506271. The cubic root of 11897021 is about 228.2860687981.

The spelling of 11897021 in words is "eleven million, eight hundred ninety-seven thousand, twenty-one".