1221122211023 has 16 divisors (see below), whose sum is σ = 1435820051232. Its totient is φ = 1023850128000.

The previous prime is 1221122211011. The next prime is 1221122211053. The reversal of 1221122211023 is 3201122211221.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221122211023 is a prime.

It is a super-2 number, since 2×1221122211023² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221122210986 and 1221122211004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221122211053) 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, 3446408 + ... + 3784173.

It is an arithmetic number, because the mean of its divisors is an integer number (89738753202).

Almost surely, 2^{1221122211023} is an apocalyptic number.

1221122211023 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1221122211023 is a deficient number, since it is larger than the sum of its proper divisors (214697840209).

1221122211023 is a wasteful number, since it uses less digits than its factorization.

1221122211023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7231786.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 1221122211023 its reverse (3201122211221), we get a palindrome (4422244422244).

The spelling of 1221122211023 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-two million, two hundred eleven thousand, twenty-three".