21210110110202 has 8 divisors (see below), whose sum is σ = 34262485562676. Its totient is φ = 9789281589312.

The previous prime is 21210110110109. The next prime is 21210110110207. The reversal of 21210110110202 is 20201101101212.

It can be written as a sum of positive squares in 2 ways, for example, as 17804273079121 + 3405837031081 = 4219511^2 + 1845491^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21210110110207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 407886732863 + ... + 407886732914.

Almost surely, 2^{21210110110202} is an apocalyptic number.

21210110110202 is a deficient number, since it is larger than the sum of its proper divisors (13052375452474).

21210110110202 is a wasteful number, since it uses less digits than its factorization.

21210110110202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815773465792.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21210110110202 its reverse (20201101101212), we get a palindrome (41411211211414).

The spelling of 21210110110202 in words is "twenty-one trillion, two hundred ten billion, one hundred ten million, one hundred ten thousand, two hundred two".