21212011310 has 24 divisors (see below), whose sum is σ = 44415355320. Its totient is φ = 7272689424.

The previous prime is 21212011309. The next prime is 21212011339. The reversal of 21212011310 is 1311021212.

It is a super-2 number, since 2×21212011310² (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 polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21644420 + ... + 21645399.

It is an arithmetic number, because the mean of its divisors is an integer number (1850639805).

Almost surely, 2^21212011310 is an apocalyptic number.

21212011310 is an abundant number, since it is smaller than the sum of its proper divisors (23203344010).

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

21212011310 is a wasteful number, since it uses less digits than its factorization.

21212011310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43289840 (or 43289833 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21212011310 its reverse (1311021212), we get a palindrome (22523032522).

The spelling of 21212011310 in words is "twenty-one billion, two hundred twelve million, eleven thousand, three hundred ten".