221220121022011 has 2 divisors, whose sum is σ = 221220121022012. Its totient is φ = 221220121022010.

The previous prime is 221220121022009. The next prime is 221220121022029. The reversal of 221220121022011 is 110220121022122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221220121022011 - 2¹ = 221220121022009 is a prime.

Together with 221220121022009, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 221220121022011.

It is not a weakly prime, because it can be changed into another prime (221220121092011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610060511005 + 110610060511006.

It is an arithmetic number, because the mean of its divisors is an integer number (110610060511006).

Almost surely, 2^{221220121022011} is an apocalyptic number.

221220121022011 is a deficient number, since it is larger than the sum of its proper divisors (1).

221220121022011 is an equidigital number, since it uses as much as digits as its factorization.

221220121022011 is an odious number, because the sum of its binary digits is odd.

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

Adding to 221220121022011 its reverse (110220121022122), we get a palindrome (331440242044133).

The spelling of 221220121022011 in words is "two hundred twenty-one trillion, two hundred twenty billion, one hundred twenty-one million, twenty-two thousand, eleven".