21233222031 has 16 divisors (see below), whose sum is σ = 32357792000. Its totient is φ = 12132367488.

The previous prime is 21233222009. The next prime is 21233222033. The reversal of 21233222031 is 13022233212.

It is a happy number.

It is not a de Polignac number, because 21233222031 - 2¹⁰ = 21233221007 is a prime.

It is a super-2 number, since 2×21233222031² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21233221989 and 21233222007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233222033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 339495 + ... + 397143.

It is an arithmetic number, because the mean of its divisors is an integer number (2022362000).

Almost surely, 2^21233222031 is an apocalyptic number.

21233222031 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21233222031 is a deficient number, since it is larger than the sum of its proper divisors (11124569969).

21233222031 is a wasteful number, since it uses less digits than its factorization.

21233222031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75198.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21233222031 its reverse (13022233212), we get a palindrome (34255455243).

The spelling of 21233222031 in words is "twenty-one billion, two hundred thirty-three million, two hundred twenty-two thousand, thirty-one".