11251020221 has 24 divisors (see below), whose sum is σ = 13695517440. Its totient is φ = 9052127136.

The previous prime is 11251020211. The next prime is 11251020229. The reversal of 11251020221 is 12202015211.

It is a de Polignac number, because none of the positive numbers 2^k-11251020221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11251020221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11251020229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 255020 + ... + 295866.

It is an arithmetic number, because the mean of its divisors is an integer number (570646560).

Almost surely, 2^11251020221 is an apocalyptic number.

It is an amenable number.

11251020221 is a deficient number, since it is larger than the sum of its proper divisors (2444497219).

11251020221 is a wasteful number, since it uses less digits than its factorization.

11251020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41001 (or 40982 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 11251020221 its reverse (12202015211), we get a palindrome (23453035432).

The spelling of 11251020221 in words is "eleven billion, two hundred fifty-one million, twenty thousand, two hundred twenty-one".