221221100023 has 24 divisors (see below), whose sum is σ = 280982699280. Its totient is φ = 172226920320.

The previous prime is 221221099963. The next prime is 221221100033. The reversal of 221221100023 is 320001122122.

It is a happy number.

It is not a de Polignac number, because 221221100023 - 2⁹ = 221221099511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221221100033) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 426765 + ... + 790297.

It is an arithmetic number, because the mean of its divisors is an integer number (11707612470).

Almost surely, 2^221221100023 is an apocalyptic number.

221221100023 is a deficient number, since it is larger than the sum of its proper divisors (59761599257).

221221100023 is a wasteful number, since it uses less digits than its factorization.

221221100023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364687 (or 364680 counting only the distinct ones).

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

Adding to 221221100023 its reverse (320001122122), we get a palindrome (541222222145).

The spelling of 221221100023 in words is "two hundred twenty-one billion, two hundred twenty-one million, one hundred thousand, twenty-three".