1221210702211 has 2 divisors, whose sum is σ = 1221210702212. Its totient is φ = 1221210702210.

The previous prime is 1221210702209. The next prime is 1221210702221. The reversal of 1221210702211 is 1122070121221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221210702211 - 2¹ = 1221210702209 is a prime.

Together with 1221210702209, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1221210702221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610605351105 + 610605351106.

It is an arithmetic number, because the mean of its divisors is an integer number (610605351106).

Almost surely, 2^{1221210702211} is an apocalyptic number.

1221210702211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221210702211 is an equidigital number, since it uses as much as digits as its factorization.

1221210702211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 22.

Adding to 1221210702211 its reverse (1122070121221), we get a palindrome (2343280823432).

The spelling of 1221210702211 in words is "one trillion, two hundred twenty-one billion, two hundred ten million, seven hundred two thousand, two hundred eleven".