21203320110 has 64 divisors (see below), whose sum is σ = 58302941184. Its totient is φ = 4834368000.

The previous prime is 21203320093. The next prime is 21203320111. The reversal of 21203320110 is 1102330212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21203320110.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203320111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41686 + ... + 210105.

It is an arithmetic number, because the mean of its divisors is an integer number (910983456).

Almost surely, 2^21203320110 is an apocalyptic number.

21203320110 is an abundant number, since it is smaller than the sum of its proper divisors (37099621074).

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

21203320110 is a wasteful number, since it uses less digits than its factorization.

21203320110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252209.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21203320110 its reverse (1102330212), we get a palindrome (22305650322).

The spelling of 21203320110 in words is "twenty-one billion, two hundred three million, three hundred twenty thousand, one hundred ten".