1223121023011 has 16 divisors (see below), whose sum is σ = 1248975789984. Its totient is φ = 1197539057664.

The previous prime is 1223121023009. The next prime is 1223121023021. The reversal of 1223121023011 is 1103201213221.

It is a cyclic number.

It is not a de Polignac number, because 1223121023011 - 2¹ = 1223121023009 is a prime.

It is a super-2 number, since 2×1223121023011² (a number of 25 digits) contains 22 as substring.

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 1223121023011.

It is not an unprimeable number, because it can be changed into a prime (1223121023021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6486615 + ... + 6672511.

It is an arithmetic number, because the mean of its divisors is an integer number (78060986874).

Almost surely, 2^{1223121023011} is an apocalyptic number.

1223121023011 is a deficient number, since it is larger than the sum of its proper divisors (25854766973).

1223121023011 is a wasteful number, since it uses less digits than its factorization.

1223121023011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186630.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1223121023011 its reverse (1103201213221), we get a palindrome (2326322236232).

The spelling of 1223121023011 in words is "one trillion, two hundred twenty-three billion, one hundred twenty-one million, twenty-three thousand, eleven".