12211212100021 has 4 divisors (see below), whose sum is σ = 13321322290944. Its totient is φ = 11101101909100.

The previous prime is 12211212099997. The next prime is 12211212100039. The reversal of 12211212100021 is 12000121211221.

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.

It is a cyclic number.

It is not a de Polignac number, because 12211212100021 - 2⁷ = 12211212099893 is a prime.

It is a super-2 number, since 2×12211212100021² (a number of 27 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 = 12211212099968 and 12211212100004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211212103021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 555055095445 + ... + 555055095466.

It is an arithmetic number, because the mean of its divisors is an integer number (3330330572736).

Almost surely, 2^{12211212100021} is an apocalyptic number.

12211212100021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12211212100021 is a deficient number, since it is larger than the sum of its proper divisors (1110110190923).

12211212100021 is a wasteful number, since it uses less digits than its factorization.

12211212100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1110110190922.

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

Adding to 12211212100021 its reverse (12000121211221), we get a palindrome (24211333311242).

The spelling of 12211212100021 in words is "twelve trillion, two hundred eleven billion, two hundred twelve million, one hundred thousand, twenty-one".