21211313012 has 12 divisors (see below), whose sum is σ = 37121201796. Its totient is φ = 10605255360.

The previous prime is 21211313003. The next prime is 21211313017. The reversal of 21211313012 is 21031311212.

It can be written as a sum of positive squares in 2 ways, for example, as 17829192676 + 3382120336 = 133526^2 + 58156^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211313017) 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, 40712 + ... + 209952.

It is an arithmetic number, because the mean of its divisors is an integer number (3093433483).

Almost surely, 2^21211313012 is an apocalyptic number.

It is an amenable number.

21211313012 is a deficient number, since it is larger than the sum of its proper divisors (15909888784).

21211313012 is a wasteful number, since it uses less digits than its factorization.

21211313012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200578 (or 200576 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21211313012 its reverse (21031311212), we get a palindrome (42242624224).

The spelling of 21211313012 in words is "twenty-one billion, two hundred eleven million, three hundred thirteen thousand, twelve".