21101000012 has 48 divisors (see below), whose sum is σ = 39644035200. Its totient is φ = 9797230080.

The previous prime is 21101000003. The next prime is 21101000023. The reversal of 21101000012 is 21000010112.

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, 1576187 + ... + 1589517.

It is an arithmetic number, because the mean of its divisors is an integer number (825917400).

Almost surely, 2^21101000012 is an apocalyptic number.

It is an amenable number.

21101000012 is a deficient number, since it is larger than the sum of its proper divisors (18543035188).

21101000012 is a wasteful number, since it uses less digits than its factorization.

21101000012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13766 (or 13764 counting only the distinct ones).

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

Adding to 21101000012 its reverse (21000010112), we get a palindrome (42101010124).

The spelling of 21101000012 in words is "twenty-one billion, one hundred one million, twelve", and thus it is an aban number.