220031212111 has 4 divisors (see below), whose sum is σ = 223638281224. Its totient is φ = 216424143000.

The previous prime is 220031212081. The next prime is 220031212169. The reversal of 220031212111 is 111212130022.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 220031212111 - 2¹⁵ = 220031179343 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 (220031212811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1803534465 + ... + 1803534586.

It is an arithmetic number, because the mean of its divisors is an integer number (55909570306).

Almost surely, 2^220031212111 is an apocalyptic number.

220031212111 is a deficient number, since it is larger than the sum of its proper divisors (3607069113).

220031212111 is an equidigital number, since it uses as much as digits as its factorization.

220031212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3607069112.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 220031212111 its reverse (111212130022), we get a palindrome (331243342133).

The spelling of 220031212111 in words is "two hundred twenty billion, thirty-one million, two hundred twelve thousand, one hundred eleven".