1220121022211 has 12 divisors (see below), whose sum is σ = 1509938443152. Its totient is φ = 965370478176.

The previous prime is 1220121022193. The next prime is 1220121022273. The reversal of 1220121022211 is 1122201210221.

It is not a de Polignac number, because 1220121022211 - 2⁶ = 1220121022147 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220121022211.

It is not an unprimeable number, because it can be changed into a prime (1220121022511) 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 in 11 ways as a sum of consecutive naturals, for example, 515688176 + ... + 515690541.

It is an arithmetic number, because the mean of its divisors is an integer number (125828203596).

Almost surely, 2^{1220121022211} is an apocalyptic number.

1220121022211 is a deficient number, since it is larger than the sum of its proper divisors (289817420941).

1220121022211 is a wasteful number, since it uses less digits than its factorization.

1220121022211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1031378750 (or 1031378737 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1220121022211 its reverse (1122201210221), we get a palindrome (2342322232432).

The spelling of 1220121022211 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, twenty-two thousand, two hundred eleven".