1221220022011 has 32 divisors (see below), whose sum is σ = 1414204075008. Its totient is φ = 1042233162240.

The previous prime is 1221220021963. The next prime is 1221220022083. The reversal of 1221220022011 is 1102200221221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1221220022011 - 2¹⁵ = 1221219989243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221220022611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 134683900 + ... + 134692966.

It is an arithmetic number, because the mean of its divisors is an integer number (44193877344).

Almost surely, 2^{1221220022011} is an apocalyptic number.

1221220022011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1221220022011 is a deficient number, since it is larger than the sum of its proper divisors (192984052997).

1221220022011 is a wasteful number, since it uses less digits than its factorization.

1221220022011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10851.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1221220022011 its reverse (1102200221221), we get a palindrome (2323420243232).

The spelling of 1221220022011 in words is "one trillion, two hundred twenty-one billion, two hundred twenty million, twenty-two thousand, eleven".