221310121321023 has 16 divisors (see below), whose sum is σ = 337237222533120. Its totient is φ = 126461894488416.

The previous prime is 221310121321007. The next prime is 221310121321027. The reversal of 221310121321023 is 320123121013122.

It is not a de Polignac number, because 221310121321023 - 2⁴ = 221310121321007 is a prime.

It is a super-4 number, since 4×221310121321023⁴ (a number of 58 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221310121320984 and 221310121321002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221310121321027) 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, 40360740 + ... + 45514937.

It is an arithmetic number, because the mean of its divisors is an integer number (21077326408320).

Almost surely, 2^{221310121321023} is an apocalyptic number.

221310121321023 is a deficient number, since it is larger than the sum of its proper divisors (115927101212097).

221310121321023 is a wasteful number, since it uses less digits than its factorization.

221310121321023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85998406.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 221310121321023 its reverse (320123121013122), we get a palindrome (541433242334145).

The spelling of 221310121321023 in words is "two hundred twenty-one trillion, three hundred ten billion, one hundred twenty-one million, three hundred twenty-one thousand, twenty-three".