12211222012021 has 4 divisors (see below), whose sum is σ = 12289000496332. Its totient is φ = 12133443527712.

The previous prime is 12211222012007. The next prime is 12211222012057. The reversal of 12211222012021 is 12021022211221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6707323022500 + 5503898989521 = 2589850^2 + 2346039^2 .

It is a cyclic number.

It is not a de Polignac number, because 12211222012021 - 2¹³ = 12211222003829 is a prime.

It is a super-2 number, since 2×12211222012021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12211222012021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211222012001) 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, 38889241920 + ... + 38889242233.

It is an arithmetic number, because the mean of its divisors is an integer number (3072250124083).

Almost surely, 2^{12211222012021} is an apocalyptic number.

It is an amenable number.

12211222012021 is a deficient number, since it is larger than the sum of its proper divisors (77778484311).

12211222012021 is an equidigital number, since it uses as much as digits as its factorization.

12211222012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77778484310.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 12211222012021 its reverse (12021022211221), we get a palindrome (24232244223242).

The spelling of 12211222012021 in words is "twelve trillion, two hundred eleven billion, two hundred twenty-two million, twelve thousand, twenty-one".