11921099 has 4 divisors (see below), whose sum is σ = 11933064. Its totient is φ = 11909136.

The previous prime is 11921089. The next prime is 11921101. The reversal of 11921099 is 99012911.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11921099 - 2⁴ = 11921083 is a prime.

It is a super-2 number, since 2×11921099² = 284225202735602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11921069) 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, 4337 + ... + 6530.

It is an arithmetic number, because the mean of its divisors is an integer number (2983266).

Almost surely, 2^11921099 is an apocalyptic number.

11921099 is a deficient number, since it is larger than the sum of its proper divisors (11965).

11921099 is a wasteful number, since it uses less digits than its factorization.

11921099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11964.

The product of its (nonzero) digits is 1458, while the sum is 32.

The square root of 11921099 is about 3452.6944550597. The cubic root of 11921099 is about 228.4399719741.

The spelling of 11921099 in words is "eleven million, nine hundred twenty-one thousand, ninety-nine".