21103211310 has 16 divisors (see below), whose sum is σ = 50647707216. Its totient is φ = 5627523008.

The previous prime is 21103211309. The next prime is 21103211329. The reversal of 21103211310 is 1311230112.

It is a happy number.

It is a super-2 number, since 2×21103211310² (a number of 21 digits) contains 22 as substring.

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 21103211310.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 351720159 + ... + 351720218.

It is an arithmetic number, because the mean of its divisors is an integer number (3165481701).

Almost surely, 2^21103211310 is an apocalyptic number.

21103211310 is an abundant number, since it is smaller than the sum of its proper divisors (29544495906).

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

21103211310 is a wasteful number, since it uses less digits than its factorization.

21103211310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703440387.

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

Adding to 21103211310 its reverse (1311230112), we get a palindrome (22414441422).

The spelling of 21103211310 in words is "twenty-one billion, one hundred three million, two hundred eleven thousand, three hundred ten".