21013313212 has 12 divisors (see below), whose sum is σ = 37098726336. Its totient is φ = 10413677120.

The previous prime is 21013313183. The next prime is 21013313213. The reversal of 21013313212 is 21231331012.

It is a super-2 number, since 2×21013313212² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21013313212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013313213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23244364 + ... + 23245267.

It is an arithmetic number, because the mean of its divisors is an integer number (3091560528).

Almost surely, 2^21013313212 is an apocalyptic number.

It is an amenable number.

21013313212 is a deficient number, since it is larger than the sum of its proper divisors (16085413124).

21013313212 is a wasteful number, since it uses less digits than its factorization.

21013313212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46489748 (or 46489746 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21013313212 its reverse (21231331012), we get a palindrome (42244644224).

The spelling of 21013313212 in words is "twenty-one billion, thirteen million, three hundred thirteen thousand, two hundred twelve".