21002231223 has 6 divisors (see below), whose sum is σ = 30336556224. Its totient is φ = 14001487476.

The previous prime is 21002231209. The next prime is 21002231231. The reversal of 21002231223 is 32213220012.

21002231223 is a `hidden beast` number, since 210 + 0 + 2 + 231 + 223 = 666.

It is not a de Polignac number, because 21002231223 - 2¹³ = 21002223031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21002231196 and 21002231205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002231023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1166790615 + ... + 1166790632.

It is an arithmetic number, because the mean of its divisors is an integer number (5056092704).

Almost surely, 2^21002231223 is an apocalyptic number.

21002231223 is a deficient number, since it is larger than the sum of its proper divisors (9334325001).

21002231223 is a wasteful number, since it uses less digits than its factorization.

21002231223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2333581253 (or 2333581250 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21002231223 its reverse (32213220012), we get a palindrome (53215451235).

The spelling of 21002231223 in words is "twenty-one billion, two million, two hundred thirty-one thousand, two hundred twenty-three".