21201100210110 has 128 divisors (see below), whose sum is σ = 52436721991680. Its totient is φ = 5484332520576.

The previous prime is 21201100210049. The next prime is 21201100210133. The reversal of 21201100210110 is 1101200110212.

It is a super-2 number, since 2×21201100210110² (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 63 ways as a sum of consecutive naturals, for example, 30660039 + ... + 31343901.

It is an arithmetic number, because the mean of its divisors is an integer number (409661890560).

Almost surely, 2^{21201100210110} is an apocalyptic number.

21201100210110 is an abundant number, since it is smaller than the sum of its proper divisors (31235621781570).

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

21201100210110 is a wasteful number, since it uses less digits than its factorization.

21201100210110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684182.

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

Adding to 21201100210110 its reverse (1101200110212), we get a palindrome (22302300320322).

The spelling of 21201100210110 in words is "twenty-one trillion, two hundred one billion, one hundred million, two hundred ten thousand, one hundred ten".