21311223321 has 16 divisors (see below), whose sum is σ = 29654112384. Its totient is φ = 13588063104.

The previous prime is 21311223257. The next prime is 21311223397. The reversal of 21311223321 is 12332211312.

It is not a de Polignac number, because 21311223321 - 2⁶ = 21311223257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21311227321) 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, 763015 + ... + 790451.

It is an arithmetic number, because the mean of its divisors is an integer number (1853382024).

Almost surely, 2^21311223321 is an apocalyptic number.

It is an amenable number.

21311223321 is a deficient number, since it is larger than the sum of its proper divisors (8342889063).

21311223321 is a wasteful number, since it uses less digits than its factorization.

21311223321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38720.

The product of its digits is 432, while the sum is 21.

Adding to 21311223321 its reverse (12332211312), we get a palindrome (33643434633).

The spelling of 21311223321 in words is "twenty-one billion, three hundred eleven million, two hundred twenty-three thousand, three hundred twenty-one".