11243210921 has 4 divisors (see below), whose sum is σ = 11325278292. Its totient is φ = 11161143552.

The previous prime is 11243210857. The next prime is 11243210963. The reversal of 11243210921 is 12901234211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12901234211 = 907 ⋅14224073.

It can be written as a sum of positive squares in 2 ways, for example, as 9534546025 + 1708664896 = 97645^2 + 41336^2 .

It is a cyclic number.

It is not a de Polignac number, because 11243210921 - 2⁶ = 11243210857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11243210971) 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, 41033480 + ... + 41033753.

It is an arithmetic number, because the mean of its divisors is an integer number (2831319573).

Almost surely, 2^11243210921 is an apocalyptic number.

It is an amenable number.

11243210921 is a deficient number, since it is larger than the sum of its proper divisors (82067371).

11243210921 is an equidigital number, since it uses as much as digits as its factorization.

11243210921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82067370.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 11243210921 in words is "eleven billion, two hundred forty-three million, two hundred ten thousand, nine hundred twenty-one".