111212011021 has 4 divisors (see below), whose sum is σ = 116047315872. Its totient is φ = 106376706172.

The previous prime is 111212010997. The next prime is 111212011061. The reversal of 111212011021 is 120110212111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120110212111 = 67 ⋅1792689733.

It is a cyclic number.

It is not a de Polignac number, because 111212011021 - 2¹³ = 111212002829 is a prime.

It is a super-2 number, since 2×111212011021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111212010992 and 111212011010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212011061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2417652391 + ... + 2417652436.

It is an arithmetic number, because the mean of its divisors is an integer number (29011828968).

Almost surely, 2^111212011021 is an apocalyptic number.

It is an amenable number.

111212011021 is a deficient number, since it is larger than the sum of its proper divisors (4835304851).

111212011021 is an equidigital number, since it uses as much as digits as its factorization.

111212011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4835304850.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 111212011021 its reverse (120110212111), we get a palindrome (231322223132).

The spelling of 111212011021 in words is "one hundred eleven billion, two hundred twelve million, eleven thousand, twenty-one".