2111221720501 has 8 divisors (see below), whose sum is σ = 2113722177984. Its totient is φ = 2108721535680.

The previous prime is 2111221720499. The next prime is 2111221720523. The reversal of 2111221720501 is 1050271221112.

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

It is a cyclic number.

It is not a de Polignac number, because 2111221720501 - 2¹ = 2111221720499 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111221720571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18350566 + ... + 18465256.

It is an arithmetic number, because the mean of its divisors is an integer number (264215272248).

Almost surely, 2^{2111221720501} is an apocalyptic number.

It is an amenable number.

2111221720501 is a deficient number, since it is larger than the sum of its proper divisors (2500457483).

2111221720501 is a wasteful number, since it uses less digits than its factorization.

2111221720501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136331.

The product of its (nonzero) digits is 560, while the sum is 25.

Adding to 2111221720501 its reverse (1050271221112), we get a palindrome (3161492941613).

The spelling of 2111221720501 in words is "two trillion, one hundred eleven billion, two hundred twenty-one million, seven hundred twenty thousand, five hundred one".