111221202423 has 16 divisors (see below), whose sum is σ = 148775131520. Its totient is φ = 73907606304.

The previous prime is 111221202377. The next prime is 111221202431. The reversal of 111221202423 is 324202122111.

It is a happy number.

It is not a de Polignac number, because 111221202423 - 2¹⁸ = 111220940279 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 111221202423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221202473) 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, 1930665 + ... + 1987437.

It is an arithmetic number, because the mean of its divisors is an integer number (9298445720).

Almost surely, 2^111221202423 is an apocalyptic number.

111221202423 is a deficient number, since it is larger than the sum of its proper divisors (37553929097).

111221202423 is a wasteful number, since it uses less digits than its factorization.

111221202423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58878.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 111221202423 its reverse (324202122111), we get a palindrome (435423324534).

The spelling of 111221202423 in words is "one hundred eleven billion, two hundred twenty-one million, two hundred two thousand, four hundred twenty-three".