21011102102 has 8 divisors (see below), whose sum is σ = 31679952456. Its totient is φ = 10451117952.

The previous prime is 21011102059. The next prime is 21011102137. The reversal of 21011102102 is 20120111012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27216068 + ... + 27216839.

It is an arithmetic number, because the mean of its divisors is an integer number (3959994057).

Almost surely, 2^21011102102 is an apocalyptic number.

21011102102 is a deficient number, since it is larger than the sum of its proper divisors (10668850354).

21011102102 is a wasteful number, since it uses less digits than its factorization.

21011102102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54433102.

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

Adding to 21011102102 its reverse (20120111012), we get a palindrome (41131213114).

The spelling of 21011102102 in words is "twenty-one billion, eleven million, one hundred two thousand, one hundred two".