11949394921 has 8 divisors (see below), whose sum is σ = 12057321024. Its totient is φ = 11841902160.

The previous prime is 11949394913. The next prime is 11949394969. The reversal of 11949394921 is 12949394911.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11949394921 - 2³ = 11949394913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11949394021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52810 + ... + 163363.

It is an arithmetic number, because the mean of its divisors is an integer number (1507165128).

Almost surely, 2^11949394921 is an apocalyptic number.

It is an amenable number.

11949394921 is a deficient number, since it is larger than the sum of its proper divisors (107926103).

11949394921 is a wasteful number, since it uses less digits than its factorization.

11949394921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216671.

The product of its digits is 629856, while the sum is 52.

The spelling of 11949394921 in words is "eleven billion, nine hundred forty-nine million, three hundred ninety-four thousand, nine hundred twenty-one".