11421021243 has 32 divisors (see below), whose sum is σ = 16860220416. Its totient is φ = 6840142848.

The previous prime is 11421021233. The next prime is 11421021257. The reversal of 11421021243 is 34212012411.

It is not a de Polignac number, because 11421021243 - 2⁹ = 11421020731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11421021223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 561255 + ... + 581247.

It is an arithmetic number, because the mean of its divisors is an integer number (526881888).

Almost surely, 2^11421021243 is an apocalyptic number.

11421021243 is a deficient number, since it is larger than the sum of its proper divisors (5439199173).

11421021243 is a wasteful number, since it uses less digits than its factorization.

11421021243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20523.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 11421021243 its reverse (34212012411), we get a palindrome (45633033654).

The spelling of 11421021243 in words is "eleven billion, four hundred twenty-one million, twenty-one thousand, two hundred forty-three".