21112222011221 has 4 divisors (see below), whose sum is σ = 23031514921344. Its totient is φ = 19192929101100.

The previous prime is 21112222011193. The next prime is 21112222011253. The reversal of 21112222011221 is 12211022221112.

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 a de Polignac number, because none of the positive numbers 2^k-21112222011221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21112222011193 and 21112222011202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112222017221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 959646455045 + ... + 959646455066.

It is an arithmetic number, because the mean of its divisors is an integer number (5757878730336).

Almost surely, 2^{21112222011221} is an apocalyptic number.

It is an amenable number.

21112222011221 is a deficient number, since it is larger than the sum of its proper divisors (1919292910123).

21112222011221 is a wasteful number, since it uses less digits than its factorization.

21112222011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1919292910122.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21112222011221 its reverse (12211022221112), we get a palindrome (33323244232333).

The spelling of 21112222011221 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty-two million, eleven thousand, two hundred twenty-one".