21001111010110 has 96 divisors (see below), whose sum is σ = 47501443100160. Its totient is φ = 6543783702720.

The previous prime is 21001111010051. The next prime is 21001111010123. The reversal of 21001111010110 is 1101011110012.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 27223327 + ... + 27984133.

It is an arithmetic number, because the mean of its divisors is an integer number (494806698960).

Almost surely, 2^{21001111010110} is an apocalyptic number.

21001111010110 is an abundant number, since it is smaller than the sum of its proper divisors (26500332090050).

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

21001111010110 is a wasteful number, since it uses less digits than its factorization.

21001111010110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764102 (or 764091 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 10.

Adding to 21001111010110 its reverse (1101011110012), we get a palindrome (22102122120122).

The spelling of 21001111010110 in words is "twenty-one trillion, one billion, one hundred eleven million, ten thousand, one hundred ten".