2111221720524 has 48 divisors (see below), whose sum is σ = 5961096626688. Its totient is φ = 567723487488.

The previous prime is 2111221720523. The next prime is 2111221720529. The reversal of 2111221720524 is 4250271221112.

It is a junction number, because it is equal to n+sod(n) for n = 2111221720491 and 2111221720500.

It is not an unprimeable number, because it can be changed into a prime (2111221720523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 739221864 + ... + 739224719.

It is an arithmetic number, because the mean of its divisors is an integer number (124189513056).

Almost surely, 2^{2111221720524} is an apocalyptic number.

It is an amenable number.

2111221720524 is an abundant number, since it is smaller than the sum of its proper divisors (3849874906164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2111221720524 is a wasteful number, since it uses less digits than its factorization.

2111221720524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1478446614 (or 1478446612 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 30.

Adding to 2111221720524 its reverse (4250271221112), we get a palindrome (6361492941636).

The spelling of 2111221720524 in words is "two trillion, one hundred eleven billion, two hundred twenty-one million, seven hundred twenty thousand, five hundred twenty-four".