2112221002421 has 2 divisors, whose sum is σ = 2112221002422. Its totient is φ = 2112221002420.

The previous prime is 2112221002373. The next prime is 2112221002453. The reversal of 2112221002421 is 1242001222112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1923505479025 + 188715523396 = 1386905^2 + 434414^2 .

It is a cyclic number.

It is not a de Polignac number, because 2112221002421 - 2¹⁴ = 2112220986037 is a prime.

It is a super-2 number, since 2×2112221002421² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2112221002393 and 2112221002402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2112221002121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1056110501210 + 1056110501211.

It is an arithmetic number, because the mean of its divisors is an integer number (1056110501211).

Almost surely, 2^{2112221002421} is an apocalyptic number.

It is an amenable number.

2112221002421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2112221002421 is an equidigital number, since it uses as much as digits as its factorization.

2112221002421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 2112221002421 its reverse (1242001222112), we get a palindrome (3354222224533).

The spelling of 2112221002421 in words is "two trillion, one hundred twelve billion, two hundred twenty-one million, two thousand, four hundred twenty-one".