21121211100110 has 32 divisors (see below), whose sum is σ = 41524528735872. Its totient is φ = 7671153256480.

The previous prime is 21121211100109. The next prime is 21121211100221. The reversal of 21121211100110 is 1100111212112.

It is a super-2 number, since 2×21121211100110² (a number of 27 digits) contains 22 as substring.

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, 115997912 + ... + 116179851.

It is an arithmetic number, because the mean of its divisors is an integer number (1297641522996).

Almost surely, 2^{21121211100110} is an apocalyptic number.

21121211100110 is a deficient number, since it is larger than the sum of its proper divisors (20403317635762).

21121211100110 is a wasteful number, since it uses less digits than its factorization.

21121211100110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232178608.

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

Adding to 21121211100110 its reverse (1100111212112), we get a palindrome (22221322312222).

The spelling of 21121211100110 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred eleven million, one hundred thousand, one hundred ten".