21211202110110 has 16 divisors (see below), whose sum is σ = 50906885064336. Its totient is φ = 5656320562688.

The previous prime is 21211202110067. The next prime is 21211202110201. The reversal of 21211202110110 is 1101120211212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21211202110110.

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, 353520035139 + ... + 353520035198.

It is an arithmetic number, because the mean of its divisors is an integer number (3181680316521).

Almost surely, 2^{21211202110110} is an apocalyptic number.

21211202110110 is an abundant number, since it is smaller than the sum of its proper divisors (29695682954226).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21211202110110 is a wasteful number, since it uses less digits than its factorization.

21211202110110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707040070347.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21211202110110 its reverse (1101120211212), we get a palindrome (22312322321322).

The spelling of 21211202110110 in words is "twenty-one trillion, two hundred eleven billion, two hundred two million, one hundred ten thousand, one hundred ten".