21123300331 has 16 divisors (see below), whose sum is σ = 25415688960. Its totient is φ = 17149920480.

The previous prime is 21123300329. The next prime is 21123300337. The reversal of 21123300331 is 13300332112.

It is not a de Polignac number, because 21123300331 - 2¹ = 21123300329 is a prime.

It is a super-2 number, since 2×21123300331² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a junction number, because it is equal to n+sod(n) for n = 21123300299 and 21123300308.

It is not an unprimeable number, because it can be changed into a prime (21123300337) 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, 1249920 + ... + 1266706.

It is an arithmetic number, because the mean of its divisors is an integer number (1588480560).

Almost surely, 2^21123300331 is an apocalyptic number.

21123300331 is a deficient number, since it is larger than the sum of its proper divisors (4292388629).

21123300331 is a wasteful number, since it uses less digits than its factorization.

21123300331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26274.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21123300331 its reverse (13300332112), we get a palindrome (34423632443).

The spelling of 21123300331 in words is "twenty-one billion, one hundred twenty-three million, three hundred thousand, three hundred thirty-one".