12211202021 has 4 divisors (see below), whose sum is σ = 12742123872. Its totient is φ = 11680280172.

The previous prime is 12211201993. The next prime is 12211202027. The reversal of 12211202021 is 12020211221.

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-12211202021 is a prime.

It is a super-2 number, since 2×12211202021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12211201987 and 12211202005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211202027) 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, 265460891 + ... + 265460936.

It is an arithmetic number, because the mean of its divisors is an integer number (3185530968).

Almost surely, 2^12211202021 is an apocalyptic number.

It is an amenable number.

12211202021 is a deficient number, since it is larger than the sum of its proper divisors (530921851).

12211202021 is an equidigital number, since it uses as much as digits as its factorization.

12211202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530921850.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12211202021 its reverse (12020211221), we get a palindrome (24231413242).

It can be divided in two parts, 1221 and 1202021, that multiplied together give a palindrome (1467667641).

The spelling of 12211202021 in words is "twelve billion, two hundred eleven million, two hundred two thousand, twenty-one".