21220313013 has 28 divisors (see below), whose sum is σ = 31904932320. Its totient is φ = 14107295016.

The previous prime is 21220312991. The next prime is 21220313021. The reversal of 21220313013 is 31031302212.

It is not a de Polignac number, because 21220313013 - 2¹⁸ = 21220050869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220313713) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 221170 + ... + 302252.

Almost surely, 2^21220313013 is an apocalyptic number.

It is an amenable number.

21220313013 is a deficient number, since it is larger than the sum of its proper divisors (10684619307).

21220313013 is an frugal number, since it uses more digits than its factorization.

21220313013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81460 (or 81445 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21220313013 its reverse (31031302212), we get a palindrome (52251615225).

The spelling of 21220313013 in words is "twenty-one billion, two hundred twenty million, three hundred thirteen thousand, thirteen".