1221122220023 has 8 divisors (see below), whose sum is σ = 1232834037600. Its totient is φ = 1209419654688.

The previous prime is 1221122219921. The next prime is 1221122220061. The reversal of 1221122220023 is 3200222211221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221122220023 - 2⁸ = 1221122219767 is a prime.

It is a super-2 number, since 2×1221122220023² (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 = 1221122219977 and 1221122220004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221182220023) 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 7 ways as a sum of consecutive naturals, for example, 2047688 + ... + 2575901.

It is an arithmetic number, because the mean of its divisors is an integer number (154104254700).

Almost surely, 2^{1221122220023} is an apocalyptic number.

1221122220023 is a deficient number, since it is larger than the sum of its proper divisors (11711817577).

1221122220023 is a wasteful number, since it uses less digits than its factorization.

1221122220023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4626121.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 1221122220023 its reverse (3200222211221), we get a palindrome (4421344431244).

The spelling of 1221122220023 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-two million, two hundred twenty thousand, twenty-three".