21100010012 has 6 divisors (see below), whose sum is σ = 36925017528. Its totient is φ = 10550005004.

The previous prime is 21100009981. The next prime is 21100010027. The reversal of 21100010012 is 21001000112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2637501248 + ... + 2637501255.

It is an arithmetic number, because the mean of its divisors is an integer number (6154169588).

Almost surely, 2^21100010012 is an apocalyptic number.

It is an amenable number.

21100010012 is a deficient number, since it is larger than the sum of its proper divisors (15825007516).

21100010012 is a wasteful number, since it uses less digits than its factorization.

21100010012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5275002507 (or 5275002505 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 21100010012 its reverse (21001000112), we get a palindrome (42101010124).

It can be divided in two parts, 211000100 and 12, that added together give a palindrome (211000112).

The spelling of 21100010012 in words is "twenty-one billion, one hundred million, ten thousand, twelve".