1220121222011 has 4 divisors (see below), whose sum is σ = 1231314994800. Its totient is φ = 1208927449224.

The previous prime is 1220121221993. The next prime is 1220121222091. The reversal of 1220121222011 is 1102221210221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1220121222011 - 2⁶ = 1220121221947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220121222091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5596886231 + ... + 5596886448.

It is an arithmetic number, because the mean of its divisors is an integer number (307828748700).

Almost surely, 2^{1220121222011} is an apocalyptic number.

1220121222011 is a deficient number, since it is larger than the sum of its proper divisors (11193772789).

1220121222011 is a wasteful number, since it uses less digits than its factorization.

1220121222011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11193772788.

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

Adding to 1220121222011 its reverse (1102221210221), we get a palindrome (2322342432232).

The spelling of 1220121222011 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, two hundred twenty-two thousand, eleven".