21020110102 has 32 divisors (see below), whose sum is σ = 32266128384. Its totient is φ = 10268160000.

The previous prime is 21020110091. The next prime is 21020110121. The reversal of 21020110102 is 20101102012.

It is a congruent number.

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, 7503102 + ... + 7505902.

It is an arithmetic number, because the mean of its divisors is an integer number (1008316512).

Almost surely, 2^21020110102 is an apocalyptic number.

21020110102 is a deficient number, since it is larger than the sum of its proper divisors (11246018282).

21020110102 is a wasteful number, since it uses less digits than its factorization.

21020110102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3384.

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

Adding to 21020110102 its reverse (20101102012), we get a palindrome (41121212114).

The spelling of 21020110102 in words is "twenty-one billion, twenty million, one hundred ten thousand, one hundred two".