121011221222011 has 16 divisors (see below), whose sum is σ = 121598719192800. Its totient is φ = 120424912109568.

The previous prime is 121011221221949. The next prime is 121011221222041. The reversal of 121011221222011 is 110222122110121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 121011221222011 - 2¹⁹ = 121011220697723 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 121011221222011.

It is not an unprimeable number, because it can be changed into a prime (121011221222041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1140174595 + ... + 1140280723.

It is an arithmetic number, because the mean of its divisors is an integer number (7599919949550).

Almost surely, 2^{121011221222011} is an apocalyptic number.

121011221222011 is a deficient number, since it is larger than the sum of its proper divisors (587497970789).

121011221222011 is a wasteful number, since it uses less digits than its factorization.

121011221222011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111678.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 121011221222011 its reverse (110222122110121), we get a palindrome (231233343332132).

The spelling of 121011221222011 in words is "one hundred twenty-one trillion, eleven billion, two hundred twenty-one million, two hundred twenty-two thousand, eleven".