11921047 has 4 divisors (see below), whose sum is σ = 12116536. Its totient is φ = 11725560.

The previous prime is 11921027. The next prime is 11921051. The reversal of 11921047 is 74012911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74012911 = 7 ⋅10573273.

It is a cyclic number.

It is not a de Polignac number, because 11921047 - 2²³ = 3532439 is a prime.

It is a super-2 number, since 2×11921047² = 284222723152418, 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 (11921017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97653 + ... + 97774.

It is an arithmetic number, because the mean of its divisors is an integer number (3029134).

Almost surely, 2^11921047 is an apocalyptic number.

11921047 is a deficient number, since it is larger than the sum of its proper divisors (195489).

11921047 is an equidigital number, since it uses as much as digits as its factorization.

11921047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195488.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 11921047 is about 3452.6869247008. The cubic root of 11921047 is about 228.4396398208.

Adding to 11921047 its reverse (74012911), we get a palindrome (85933958).

The spelling of 11921047 in words is "eleven million, nine hundred twenty-one thousand, forty-seven".