21220013013 has 8 divisors (see below), whose sum is σ = 28983432576. Its totient is φ = 13801634400.

The previous prime is 21220013011. The next prime is 21220013041. The reversal of 21220013013 is 31031002212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21220013013 - 2¹ = 21220013011 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21220012983 and 21220013001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220013011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86260093 + ... + 86260338.

It is an arithmetic number, because the mean of its divisors is an integer number (3622929072).

Almost surely, 2^21220013013 is an apocalyptic number.

It is an amenable number.

21220013013 is a deficient number, since it is larger than the sum of its proper divisors (7763419563).

21220013013 is a wasteful number, since it uses less digits than its factorization.

21220013013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172520475.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21220013013 its reverse (31031002212), we get a palindrome (52251015225).

The spelling of 21220013013 in words is "twenty-one billion, two hundred twenty million, thirteen thousand, thirteen".