21302213331 has 16 divisors (see below), whose sum is σ = 32477760000. Its totient is φ = 12166226688.

The previous prime is 21302213329. The next prime is 21302213353. The reversal of 21302213331 is 13331220312.

It is not a de Polignac number, because 21302213331 - 2¹ = 21302213329 is a prime.

It is a super-2 number, since 2×21302213331² (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 junction number, because it is equal to n+sod(n) for n = 21302213298 and 21302213307.

It is not an unprimeable number, because it can be changed into a prime (21302213311) 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, 228831 + ... + 308168.

It is an arithmetic number, because the mean of its divisors is an integer number (2029860000).

Almost surely, 2^21302213331 is an apocalyptic number.

21302213331 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21302213331 is a deficient number, since it is larger than the sum of its proper divisors (11175546669).

21302213331 is a wasteful number, since it uses less digits than its factorization.

21302213331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538898.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21302213331 its reverse (13331220312), we get a palindrome (34633433643).

The spelling of 21302213331 in words is "twenty-one billion, three hundred two million, two hundred thirteen thousand, three hundred thirty-one".