21115340110 has 64 divisors (see below), whose sum is σ = 42994126080. Its totient is φ = 7418442240.

The previous prime is 21115340107. The next prime is 21115340131. The reversal of 21115340110 is 1104351112.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 167625 + ... + 265195.

It is an arithmetic number, because the mean of its divisors is an integer number (671783220).

Almost surely, 2^21115340110 is an apocalyptic number.

21115340110 is an abundant number, since it is smaller than the sum of its proper divisors (21878785970).

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

21115340110 is a wasteful number, since it uses less digits than its factorization.

21115340110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97681.

The product of its (nonzero) digits is 120, while the sum is 19.

Adding to 21115340110 its reverse (1104351112), we get a palindrome (22219691222).

The spelling of 21115340110 in words is "twenty-one billion, one hundred fifteen million, three hundred forty thousand, one hundred ten".