21211121210110 has 16 divisors (see below), whose sum is σ = 41116942653696. Its totient is φ = 7831798600608.

The previous prime is 21211121210053. The next prime is 21211121210117. The reversal of 21211121210110 is 1101212111212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211121210117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81581235294 + ... + 81581235553.

It is an arithmetic number, because the mean of its divisors is an integer number (2569808915856).

Almost surely, 2^{21211121210110} is an apocalyptic number.

21211121210110 is a deficient number, since it is larger than the sum of its proper divisors (19905821443586).

21211121210110 is a wasteful number, since it uses less digits than its factorization.

21211121210110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163162470867.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 21211121210110 its reverse (1101212111212), we get a palindrome (22312333321322).

The spelling of 21211121210110 in words is "twenty-one trillion, two hundred eleven billion, one hundred twenty-one million, two hundred ten thousand, one hundred ten".