21013102110 has 256 divisors, whose sum is σ = 71696959488. Its totient is φ = 3793305600.

The previous prime is 21013102109. The next prime is 21013102111. The reversal of 21013102110 is 1120131012.

It is an interprime number because it is at equal distance from previous prime (21013102109) and next prime (21013102111).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013102111) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 489930 + ... + 531090.

It is an arithmetic number, because the mean of its divisors is an integer number (280066248).

Almost surely, 2^21013102110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21013102110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35848479744).

21013102110 is an abundant number, since it is smaller than the sum of its proper divisors (50683857378).

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

21013102110 is a wasteful number, since it uses less digits than its factorization.

21013102110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41219.

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

Adding to 21013102110 its reverse (1120131012), we get a palindrome (22133233122).

The spelling of 21013102110 in words is "twenty-one billion, thirteen million, one hundred two thousand, one hundred ten".