21201040110 has 64 divisors (see below), whose sum is σ = 51408691200. Its totient is φ = 5595448320.

The previous prime is 21201040109. The next prime is 21201040139. The reversal of 21201040110 is 1104010212.

It is a happy number.

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, 1130974 + ... + 1149566.

It is an arithmetic number, because the mean of its divisors is an integer number (803260800).

Almost surely, 2^21201040110 is an apocalyptic number.

21201040110 is an abundant number, since it is smaller than the sum of its proper divisors (30207651090).

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

21201040110 is a wasteful number, since it uses less digits than its factorization.

21201040110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18993.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21201040110 its reverse (1104010212), we get a palindrome (22305050322).

The spelling of 21201040110 in words is "twenty-one billion, two hundred one million, forty thousand, one hundred ten".