21102003012 has 72 divisors (see below), whose sum is σ = 50381461312. Its totient is φ = 6874113600.

The previous prime is 21102003001. The next prime is 21102003017. The reversal of 21102003012 is 21030020112.

It is a super-2 number, since 2×21102003012² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (21102003017) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7559337 + ... + 7562127.

Almost surely, 2^21102003012 is an apocalyptic number.

It is an amenable number.

21102003012 is an abundant number, since it is smaller than the sum of its proper divisors (29279458300).

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

21102003012 is a wasteful number, since it uses less digits than its factorization.

21102003012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3097 (or 3036 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21102003012 its reverse (21030020112), we get a palindrome (42132023124).

The spelling of 21102003012 in words is "twenty-one billion, one hundred two million, three thousand, twelve".