111212121022 has 16 divisors (see below), whose sum is σ = 167648693760. Its totient is φ = 55329893848.

The previous prime is 111212120989. The next prime is 111212121023. The reversal of 111212121022 is 220121212111.

It is a junction number, because it is equal to n+sod(n) for n = 111212120987 and 111212121005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212121023) 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, 165153 + ... + 499699.

It is an arithmetic number, because the mean of its divisors is an integer number (10478043360).

Almost surely, 2^111212121022 is an apocalyptic number.

111212121022 is a deficient number, since it is larger than the sum of its proper divisors (56436572738).

111212121022 is a wasteful number, since it uses less digits than its factorization.

111212121022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335375.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 111212121022 its reverse (220121212111), we get a palindrome (331333333133).

The spelling of 111212121022 in words is "one hundred eleven billion, two hundred twelve million, one hundred twenty-one thousand, twenty-two".