21003313012 has 48 divisors (see below), whose sum is σ = 40636209600. Its totient is φ = 9418952960.

The previous prime is 21003312997. The next prime is 21003313043. The reversal of 21003313012 is 21031330012.

It is a super-2 number, since 2×21003313012² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2950914 + ... + 2958022.

It is an arithmetic number, because the mean of its divisors is an integer number (846587700).

Almost surely, 2^21003313012 is an apocalyptic number.

21003313012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21003313012 is a deficient number, since it is larger than the sum of its proper divisors (19632896588).

21003313012 is a wasteful number, since it uses less digits than its factorization.

21003313012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8016 (or 8014 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21003313012 its reverse (21031330012), we get a palindrome (42034643024).

The spelling of 21003313012 in words is "twenty-one billion, three million, three hundred thirteen thousand, twelve".