221121020023 has 4 divisors (see below), whose sum is σ = 223187571720. Its totient is φ = 219054468328.

The previous prime is 221121020017. The next prime is 221121020089. The reversal of 221121020023 is 320020121122.

It is a happy number.

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 221121020023 - 2²⁵ = 221087465591 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221121019979 and 221121020006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121020623) 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, 1033275688 + ... + 1033275901.

It is an arithmetic number, because the mean of its divisors is an integer number (55796892930).

Almost surely, 2^221121020023 is an apocalyptic number.

221121020023 is a deficient number, since it is larger than the sum of its proper divisors (2066551697).

221121020023 is a wasteful number, since it uses less digits than its factorization.

221121020023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2066551696.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 221121020023 its reverse (320020121122), we get a palindrome (541141141145).

The spelling of 221121020023 in words is "two hundred twenty-one billion, one hundred twenty-one million, twenty thousand, twenty-three".