111212002021 has 4 divisors (see below), whose sum is σ = 111214012672. Its totient is φ = 111209991372.

The previous prime is 111212002003. The next prime is 111212002061. The reversal of 111212002021 is 120200212111.

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: 120200212111 = 7 ⋅17171458873.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111212002021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111212001992 and 111212002010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212002061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 919941 + ... + 1033786.

It is an arithmetic number, because the mean of its divisors is an integer number (27803503168).

Almost surely, 2^111212002021 is an apocalyptic number.

It is an amenable number.

111212002021 is a deficient number, since it is larger than the sum of its proper divisors (2010651).

111212002021 is an equidigital number, since it uses as much as digits as its factorization.

111212002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2010650.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 111212002021 its reverse (120200212111), we get a palindrome (231412214132).

The spelling of 111212002021 in words is "one hundred eleven billion, two hundred twelve million, two thousand, twenty-one".