21003365012 has 24 divisors (see below), whose sum is σ = 42020024256. Its totient is φ = 8998593408.

The previous prime is 21003364961. The next prime is 21003365021. The reversal of 21003365012 is 21056330012.

It is a super-2 number, since 2×21003365012² (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 7 ways as a sum of consecutive naturals, for example, 27413 + ... + 206780.

It is an arithmetic number, because the mean of its divisors is an integer number (1750834344).

Almost surely, 2^21003365012 is an apocalyptic number.

It is an amenable number.

21003365012 is an abundant number, since it is smaller than the sum of its proper divisors (21016659244).

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

21003365012 is a wasteful number, since it uses less digits than its factorization.

21003365012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237407 (or 237405 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

Adding to 21003365012 its reverse (21056330012), we get a palindrome (42059695024).

The spelling of 21003365012 in words is "twenty-one billion, three million, three hundred sixty-five thousand, twelve".