21202313012 has 12 divisors (see below), whose sum is σ = 37612322916. Its totient is φ = 10455935040.

The previous prime is 21202313003. The next prime is 21202313023. The reversal of 21202313012 is 21031320212.

It can be written as a sum of positive squares in 2 ways, for example, as 11566142116 + 9636170896 = 107546^2 + 98164^2 .

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, 36305039 + ... + 36305622.

It is an arithmetic number, because the mean of its divisors is an integer number (3134360243).

Almost surely, 2^21202313012 is an apocalyptic number.

It is an amenable number.

21202313012 is a deficient number, since it is larger than the sum of its proper divisors (16410009904).

21202313012 is a wasteful number, since it uses less digits than its factorization.

21202313012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72610738 (or 72610736 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21202313012 its reverse (21031320212), we get a palindrome (42233633224).

It can be divided in two parts, 2120 and 2313012, that added together give a palindrome (2315132).

The spelling of 21202313012 in words is "twenty-one billion, two hundred two million, three hundred thirteen thousand, twelve".