21220004013 has 16 divisors (see below), whose sum is σ = 30588323136. Its totient is φ = 13007646720.

The previous prime is 21220004011. The next prime is 21220004041. The reversal of 21220004013 is 31040002212.

It is not a de Polignac number, because 21220004013 - 2¹ = 21220004011 is a prime.

It is a super-2 number, since 2×21220004013² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21220003983 and 21220004001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220004011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1048543 + ... + 1068588.

It is an arithmetic number, because the mean of its divisors is an integer number (1911770196).

Almost surely, 2^21220004013 is an apocalyptic number.

It is an amenable number.

21220004013 is a deficient number, since it is larger than the sum of its proper divisors (9368319123).

21220004013 is a wasteful number, since it uses less digits than its factorization.

21220004013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2117404.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21220004013 its reverse (31040002212), we get a palindrome (52260006225).

The spelling of 21220004013 in words is "twenty-one billion, two hundred twenty million, four thousand, thirteen".