21323303031 has 16 divisors (see below), whose sum is σ = 30141794304. Its totient is φ = 13362301824.

The previous prime is 21323303011. The next prime is 21323303041. The reversal of 21323303031 is 13030332312.

It is not a de Polignac number, because 21323303031 - 2¹¹ = 21323300983 is a prime.

It is a super-2 number, since 2×21323303031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21323302989 and 21323303007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323303011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225495 + ... + 305768.

It is an arithmetic number, because the mean of its divisors is an integer number (1883862144).

Almost surely, 2^21323303031 is an apocalyptic number.

21323303031 is a deficient number, since it is larger than the sum of its proper divisors (8818491273).

21323303031 is a wasteful number, since it uses less digits than its factorization.

21323303031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532070.

The product of its (nonzero) digits is 972, while the sum is 21.

Adding to 21323303031 its reverse (13030332312), we get a palindrome (34353635343).

The spelling of 21323303031 in words is "twenty-one billion, three hundred twenty-three million, three hundred three thousand, thirty-one".