11921247 has 12 divisors (see below), whose sum is σ = 18544344. Its totient is φ = 7336080.

The previous prime is 11921219. The next prime is 11921251. The reversal of 11921247 is 74212911.

It is not a de Polignac number, because 11921247 - 2⁶ = 11921183 is a prime.

It is a super-2 number, since 2×11921247² = 284232260070018, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 11921247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11921297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50829 + ... + 51062.

It is an arithmetic number, because the mean of its divisors is an integer number (1545362).

Almost surely, 2^11921247 is an apocalyptic number.

11921247 is a deficient number, since it is larger than the sum of its proper divisors (6623097).

11921247 is a wasteful number, since it uses less digits than its factorization.

11921247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101910 (or 101907 counting only the distinct ones).

The product of its digits is 1008, while the sum is 27.

The square root of 11921247 is about 3452.7158875297. The cubic root of 11921247 is about 228.4409173281.

The spelling of 11921247 in words is "eleven million, nine hundred twenty-one thousand, two hundred forty-seven".