12212111021 has 4 divisors (see below), whose sum is σ = 13322302944. Its totient is φ = 11101919100.

The previous prime is 12212110997. The next prime is 12212111039. The reversal of 12212111021 is 12011121221.

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: 12011121221 = 11 ⋅1091920111.

It is a cyclic number.

It is not a de Polignac number, because 12212111021 - 2²² = 12207916717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12212110987 and 12212111005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212111221) 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, 555095945 + ... + 555095966.

It is an arithmetic number, because the mean of its divisors is an integer number (3330575736).

Almost surely, 2^12212111021 is an apocalyptic number.

12212111021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12212111021 is a deficient number, since it is larger than the sum of its proper divisors (1110191923).

12212111021 is a wasteful number, since it uses less digits than its factorization.

12212111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1110191922.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12212111021 its reverse (12011121221), we get a palindrome (24223232242).

The spelling of 12212111021 in words is "twelve billion, two hundred twelve million, one hundred eleven thousand, twenty-one".