21203332312 has 16 divisors (see below), whose sum is σ = 39921215400. Its totient is φ = 10557674880.

The previous prime is 21203332277. The next prime is 21203332343. The reversal of 21203332312 is 21323330212.

It is a super-2 number, since 2×21203332312² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5496862 + ... + 5500717.

Almost surely, 2^21203332312 is an apocalyptic number.

It is an amenable number.

21203332312 is a deficient number, since it is larger than the sum of its proper divisors (18717883088).

21203332312 is a wasteful number, since it uses less digits than its factorization.

21203332312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10997826 (or 10997822 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21203332312 its reverse (21323330212), we get a palindrome (42526662524).

The spelling of 21203332312 in words is "twenty-one billion, two hundred three million, three hundred thirty-two thousand, three hundred twelve".