21020111102 has 16 divisors (see below), whose sum is σ = 32908708512. Its totient is φ = 10050754560.

The previous prime is 21020111087. The next prime is 21020111111. The reversal of 21020111102 is 20111102012.

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, 155138 + ... + 257114.

It is an arithmetic number, because the mean of its divisors is an integer number (2056794282).

Almost surely, 2^21020111102 is an apocalyptic number.

21020111102 is a deficient number, since it is larger than the sum of its proper divisors (11888597410).

21020111102 is a wasteful number, since it uses less digits than its factorization.

21020111102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106483.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21020111102 its reverse (20111102012), we get a palindrome (41131213114).

The spelling of 21020111102 in words is "twenty-one billion, twenty million, one hundred eleven thousand, one hundred two".