211222002421 has 2 divisors, whose sum is σ = 211222002422. Its totient is φ = 211222002420.

The previous prime is 211222002419. The next prime is 211222002469. The reversal of 211222002421 is 124200222112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 195553221796 + 15668780625 = 442214^2 + 125175^2 .

It is a cyclic number.

It is not a de Polignac number, because 211222002421 - 2¹ = 211222002419 is a prime.

It is a super-2 number, since 2×211222002421² (a number of 23 digits) contains 22 as substring.

Together with 211222002419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211222002221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105611001210 + 105611001211.

It is an arithmetic number, because the mean of its divisors is an integer number (105611001211).

Almost surely, 2^211222002421 is an apocalyptic number.

It is an amenable number.

211222002421 is a deficient number, since it is larger than the sum of its proper divisors (1).

211222002421 is an equidigital number, since it uses as much as digits as its factorization.

211222002421 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 19.

Adding to 211222002421 its reverse (124200222112), we get a palindrome (335422224533).

The spelling of 211222002421 in words is "two hundred eleven billion, two hundred twenty-two million, two thousand, four hundred twenty-one".