11101993921 has 2 divisors, whose sum is σ = 11101993922. Its totient is φ = 11101993920.

The previous prime is 11101993919. The next prime is 11101993963. The reversal of 11101993921 is 12939910111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5770073521 + 5331920400 = 75961^2 + 73020^2 .

It is a cyclic number.

It is not a de Polignac number, because 11101993921 - 2¹ = 11101993919 is a prime.

Together with 11101993919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11101993421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5550996960 + 5550996961.

It is an arithmetic number, because the mean of its divisors is an integer number (5550996961).

Almost surely, 2^11101993921 is an apocalyptic number.

It is an amenable number.

11101993921 is a deficient number, since it is larger than the sum of its proper divisors (1).

11101993921 is an equidigital number, since it uses as much as digits as its factorization.

11101993921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4374, while the sum is 37.

The spelling of 11101993921 in words is "eleven billion, one hundred one million, nine hundred ninety-three thousand, nine hundred twenty-one".