21005050012 has 24 divisors (see below), whose sum is σ = 40375843200. Its totient is φ = 9517161456.

The previous prime is 21005049977. The next prime is 21005050019.

21005050012 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21005050019) 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, 6006562 + ... + 6010057.

It is an arithmetic number, because the mean of its divisors is an integer number (1682326800).

Almost surely, 2^21005050012 is an apocalyptic number.

It is an amenable number.

21005050012 is a deficient number, since it is larger than the sum of its proper divisors (19370793188).

21005050012 is a wasteful number, since it uses less digits than its factorization.

21005050012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12016665 (or 12016663 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

It can be divided in two parts, 210050 and 50012, that added together give a palindrome (260062).

The spelling of 21005050012 in words is "twenty-one billion, five million, fifty thousand, twelve".