21210111110102 has 8 divisors (see below), whose sum is σ = 31815197735112. Its totient is φ = 10605045198400.

The previous prime is 21210111110059. The next prime is 21210111110191. The reversal of 21210111110102 is 20101111101212.

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, 2297924 + ... + 6906567.

It is an arithmetic number, because the mean of its divisors is an integer number (3976899716889).

Almost surely, 2^{21210111110102} is an apocalyptic number.

21210111110102 is a deficient number, since it is larger than the sum of its proper divisors (10605086625010).

21210111110102 is a wasteful number, since it uses less digits than its factorization.

21210111110102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10356654.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21210111110102 its reverse (20101111101212), we get a palindrome (41311222211314).

The spelling of 21210111110102 in words is "twenty-one trillion, two hundred ten billion, one hundred eleven million, one hundred ten thousand, one hundred two".