2221111521 has 12 divisors (see below), whose sum is σ = 3215721600. Its totient is φ = 1477302840.

The previous prime is 2221111483. The next prime is 2221111547. The reversal of 2221111521 is 1251111222.

It is a de Polignac number, because none of the positive numbers 2^k-2221111521 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2221111494 and 2221111503.

It is not an unprimeable number, because it can be changed into a prime (2221111021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 282421 + ... + 290178.

It is an arithmetic number, because the mean of its divisors is an integer number (267976800).

Almost surely, 2^2221111521 is an apocalyptic number.

It is an amenable number.

2221111521 is a deficient number, since it is larger than the sum of its proper divisors (994610079).

2221111521 is a wasteful number, since it uses less digits than its factorization.

2221111521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573036 (or 573033 counting only the distinct ones).

The product of its digits is 80, while the sum is 18.

The square root of 2221111521 is about 47128.6698411911. The cubic root of 2221111521 is about 1304.7384317438.

Adding to 2221111521 its reverse (1251111222), we get a palindrome (3472222743).

The spelling of 2221111521 in words is "two billion, two hundred twenty-one million, one hundred eleven thousand, five hundred twenty-one".