21110331210 has 32 divisors (see below), whose sum is σ = 50675448960. Its totient is φ = 5628237888.

The previous prime is 21110331199. The next prime is 21110331217. The reversal of 21110331210 is 1213301112.

It is a happy number.

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 21110331210.

It is not an unprimeable number, because it can be changed into a prime (21110331217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76044 + ... + 219096.

It is an arithmetic number, because the mean of its divisors is an integer number (1583607780).

Almost surely, 2^21110331210 is an apocalyptic number.

21110331210 is an abundant number, since it is smaller than the sum of its proper divisors (29565117750).

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

21110331210 is a wasteful number, since it uses less digits than its factorization.

21110331210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147982.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21110331210 its reverse (1213301112), we get a palindrome (22323632322).

The spelling of 21110331210 in words is "twenty-one billion, one hundred ten million, three hundred thirty-one thousand, two hundred ten".