21331111210 has 32 divisors (see below), whose sum is σ = 39512385792. Its totient is φ = 8287131840.

The previous prime is 21331111177. The next prime is 21331111213. The reversal of 21331111210 is 1211113312.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21331111213) 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, 111657 + ... + 234796.

It is an arithmetic number, because the mean of its divisors is an integer number (1234762056).

Almost surely, 2^21331111210 is an apocalyptic number.

21331111210 is a deficient number, since it is larger than the sum of its proper divisors (18181274582).

21331111210 is a wasteful number, since it uses less digits than its factorization.

21331111210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346638.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21331111210 its reverse (1211113312), we get a palindrome (22542224522).

The spelling of 21331111210 in words is "twenty-one billion, three hundred thirty-one million, one hundred eleven thousand, two hundred ten".