21111211310 has 16 divisors (see below), whose sum is σ = 43428777696. Its totient is φ = 7238129568.

The previous prime is 21111211283. The next prime is 21111211357. The reversal of 21111211310 is 1311211112.

It is a super-2 number, since 2×21111211310² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150794297 + ... + 150794436.

It is an arithmetic number, because the mean of its divisors is an integer number (2714298606).

Almost surely, 2^21111211310 is an apocalyptic number.

21111211310 is an abundant number, since it is smaller than the sum of its proper divisors (22317566386).

21111211310 is a wasteful number, since it uses less digits than its factorization.

21111211310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301588747.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 21111211310 its reverse (1311211112), we get a palindrome (22422422422).

The spelling of 21111211310 in words is "twenty-one billion, one hundred eleven million, two hundred eleven thousand, three hundred ten".