11192421821 has 16 divisors (see below), whose sum is σ = 12965758080. Its totient is φ = 9463469760.

The previous prime is 11192421817. The next prime is 11192421829. The reversal of 11192421821 is 12812429111.

It is a cyclic number.

It is not a de Polignac number, because 11192421821 - 2² = 11192421817 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 (11192421829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140891 + ... + 205511.

It is an arithmetic number, because the mean of its divisors is an integer number (810359880).

Almost surely, 2^11192421821 is an apocalyptic number.

It is an amenable number.

11192421821 is a deficient number, since it is larger than the sum of its proper divisors (1773336259).

11192421821 is a wasteful number, since it uses less digits than its factorization.

11192421821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64964.

The product of its digits is 2304, while the sum is 32.

The spelling of 11192421821 in words is "eleven billion, one hundred ninety-two million, four hundred twenty-one thousand, eight hundred twenty-one".