21021201010110 has 128 divisors (see below), whose sum is σ = 59009531986944. Its totient is φ = 4692270643200.

The previous prime is 21021201010097. The next prime is 21021201010141. The reversal of 21021201010110 is 1101010212012.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 51275862 + ... + 51684198.

It is an arithmetic number, because the mean of its divisors is an integer number (461011968648).

Almost surely, 2^{21021201010110} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21021201010110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29504765993472).

21021201010110 is an abundant number, since it is smaller than the sum of its proper divisors (37988330976834).

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

21021201010110 is a wasteful number, since it uses less digits than its factorization.

21021201010110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414098.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21021201010110 its reverse (1101010212012), we get a palindrome (22122211222122).

The spelling of 21021201010110 in words is "twenty-one trillion, twenty-one billion, two hundred one million, ten thousand, one hundred ten".