1021221222211 has 2 divisors, whose sum is σ = 1021221222212. Its totient is φ = 1021221222210.

The previous prime is 1021221222193. The next prime is 1021221222223. The reversal of 1021221222211 is 1122221221201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1021221222211 - 2⁵ = 1021221222179 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021221222611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510610611105 + 510610611106.

It is an arithmetic number, because the mean of its divisors is an integer number (510610611106).

Almost surely, 2^{1021221222211} is an apocalyptic number.

1021221222211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021221222211 is an equidigital number, since it uses as much as digits as its factorization.

1021221222211 is an evil number, because the sum of its binary digits is even.

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

Adding to 1021221222211 its reverse (1122221221201), we get a palindrome (2143442443412).

The spelling of 1021221222211 in words is "one trillion, twenty-one billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred eleven".