21003333312 has 56 divisors (see below), whose sum is σ = 59846043376. Its totient is φ = 6462563328.

The previous prime is 21003333293. The next prime is 21003333313. The reversal of 21003333312 is 21333330012.

It is a super-2 number, since 2×21003333312² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21003333313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4204903 + ... + 4209894.

It is an arithmetic number, because the mean of its divisors is an integer number (1068679346).

Almost surely, 2^21003333312 is an apocalyptic number.

It is an amenable number.

21003333312 is an abundant number, since it is smaller than the sum of its proper divisors (38842710064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21003333312 is a wasteful number, since it uses less digits than its factorization.

21003333312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8414825 (or 8414815 counting only the distinct ones).

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

Adding to 21003333312 its reverse (21333330012), we get a palindrome (42336663324).

The spelling of 21003333312 in words is "twenty-one billion, three million, three hundred thirty-three thousand, three hundred twelve".