21001012102 has 16 divisors (see below), whose sum is σ = 36260743680. Its totient is φ = 8935681608.

The previous prime is 21001012079. The next prime is 21001012129. The reversal of 21001012102 is 20121010012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5393998 + ... + 5397889.

It is an arithmetic number, because the mean of its divisors is an integer number (2266296480).

Almost surely, 2^21001012102 is an apocalyptic number.

21001012102 is a deficient number, since it is larger than the sum of its proper divisors (15259731578).

21001012102 is a wasteful number, since it uses less digits than its factorization.

21001012102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10792035.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21001012102 its reverse (20121010012), we get a palindrome (41122022114).

The spelling of 21001012102 in words is "twenty-one billion, one million, twelve thousand, one hundred two".