21323120212 has 12 divisors (see below), whose sum is σ = 37316504596. Its totient is φ = 10661261760.

The previous prime is 21323120183. The next prime is 21323120237. The reversal of 21323120212 is 21202132312.

It can be written as a sum of positive squares in 2 ways, for example, as 7758791056 + 13564329156 = 88084^2 + 116466^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21323120212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192448 + ... + 282280.

Almost surely, 2^21323120212 is an apocalyptic number.

It is an amenable number.

21323120212 is a deficient number, since it is larger than the sum of its proper divisors (15993384384).

21323120212 is a wasteful number, since it uses less digits than its factorization.

21323120212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149178 (or 149176 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21323120212 its reverse (21202132312), we get a palindrome (42525252524).

The spelling of 21323120212 in words is "twenty-one billion, three hundred twenty-three million, one hundred twenty thousand, two hundred twelve".