11111022521 has 8 divisors (see below), whose sum is σ = 11746891200. Its totient is φ = 10480261680.

The previous prime is 11111022479. The next prime is 11111022547. The reversal of 11111022521 is 12522011111.

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

It is not a de Polignac number, because 11111022521 - 2⁶ = 11111022457 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 11111022521.

It is not an unprimeable number, because it can be changed into a prime (11111022121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1272485 + ... + 1281186.

It is an arithmetic number, because the mean of its divisors is an integer number (1468361400).

Almost surely, 2^11111022521 is an apocalyptic number.

It is an amenable number.

11111022521 is a deficient number, since it is larger than the sum of its proper divisors (635868679).

11111022521 is a wasteful number, since it uses less digits than its factorization.

11111022521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2553919.

The product of its (nonzero) digits is 40, while the sum is 17.

Adding to 11111022521 its reverse (12522011111), we get a palindrome (23633033632).

The spelling of 11111022521 in words is "eleven billion, one hundred eleven million, twenty-two thousand, five hundred twenty-one".