21223333031 has 16 divisors (see below), whose sum is σ = 21891717120. Its totient is φ = 20567092320.

The previous prime is 21223333009. The next prime is 21223333037. The reversal of 21223333031 is 13033332212.

It is a cyclic number.

It is not a de Polignac number, because 21223333031 - 2¹⁰ = 21223332007 is a prime.

It is a super-2 number, since 2×21223333031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21223332988 and 21223333006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223333037) 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, 1347341 + ... + 1363001.

It is an arithmetic number, because the mean of its divisors is an integer number (1368232320).

Almost surely, 2^21223333031 is an apocalyptic number.

21223333031 is a deficient number, since it is larger than the sum of its proper divisors (668384089).

21223333031 is a wasteful number, since it uses less digits than its factorization.

21223333031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16046.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 21223333031 its reverse (13033332212), we get a palindrome (34256665243).

The spelling of 21223333031 in words is "twenty-one billion, two hundred twenty-three million, three hundred thirty-three thousand, thirty-one".