12212000021821 has 2 divisors, whose sum is σ = 12212000021822. Its totient is φ = 12212000021820.

The previous prime is 12212000021779. The next prime is 12212000021953. The reversal of 12212000021821 is 12812000021221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11112962299321 + 1099037722500 = 3333611^2 + 1048350^2 .

It is a cyclic number.

It is not a de Polignac number, because 12212000021821 - 2¹⁵ = 12211999989053 is a prime.

It is a super-2 number, since 2×12212000021821² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12212000021792 and 12212000021801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12212000081821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6106000010910 + 6106000010911.

It is an arithmetic number, because the mean of its divisors is an integer number (6106000010911).

Almost surely, 2^{12212000021821} is an apocalyptic number.

It is an amenable number.

12212000021821 is a deficient number, since it is larger than the sum of its proper divisors (1).

12212000021821 is an equidigital number, since it uses as much as digits as its factorization.

12212000021821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 22.

The spelling of 12212000021821 in words is "twelve trillion, two hundred twelve billion, twenty-one thousand, eight hundred twenty-one".