12211120021 has 2 divisors, whose sum is σ = 12211120022. Its totient is φ = 12211120020.

The previous prime is 12211119967. The next prime is 12211120037. The reversal of 12211120021 is 12002111221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11845927921 + 365192100 = 108839^2 + 19110^2 .

It is a cyclic number.

It is not a de Polignac number, because 12211120021 - 2¹¹ = 12211117973 is a prime.

It is a super-2 number, since 2×12211120021² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12211119983 and 12211120010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12211120081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6105560010 + 6105560011.

It is an arithmetic number, because the mean of its divisors is an integer number (6105560011).

Almost surely, 2^12211120021 is an apocalyptic number.

It is an amenable number.

12211120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12211120021 is an equidigital number, since it uses as much as digits as its factorization.

12211120021 is an evil number, because the sum of its binary digits is even.

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

Adding to 12211120021 its reverse (12002111221), we get a palindrome (24213231242).

It can be divided in two parts, 122111200 and 21, that added together give a palindrome (122111221).

The spelling of 12211120021 in words is "twelve billion, two hundred eleven million, one hundred twenty thousand, twenty-one".