111212310221 has 6 divisors (see below), whose sum is σ = 115179456522. Its totient is φ = 107377402160.

The previous prime is 111212310203. The next prime is 111212310233. The reversal of 111212310221 is 122013212111.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 11233032196 + 99979278025 = 105986^2 + 316195^2 .

It is not a de Polignac number, because 111212310221 - 2²² = 111208115917 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 111212310221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212310821) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 66118250 + ... + 66119931.

It is an arithmetic number, because the mean of its divisors is an integer number (19196576087).

Almost surely, 2^111212310221 is an apocalyptic number.

It is an amenable number.

111212310221 is a deficient number, since it is larger than the sum of its proper divisors (3967146301).

111212310221 is an equidigital number, since it uses as much as digits as its factorization.

111212310221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132238239 (or 132238210 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 111212310221 its reverse (122013212111), we get a palindrome (233225522332).

The spelling of 111212310221 in words is "one hundred eleven billion, two hundred twelve million, three hundred ten thousand, two hundred twenty-one".