21001300221 has 8 divisors (see below), whose sum is σ = 30547345824. Its totient is φ = 12728060720.

The previous prime is 21001300193. The next prime is 21001300259. The reversal of 21001300221 is 12200310012.

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

It is a cyclic number.

It is not a de Polignac number, because 21001300221 - 2⁵ = 21001300189 is a prime.

It is a super-2 number, since 2×21001300221² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21001300197 and 21001300206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001302221) 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, 318201486 + ... + 318201551.

It is an arithmetic number, because the mean of its divisors is an integer number (3818418228).

Almost surely, 2^21001300221 is an apocalyptic number.

It is an amenable number.

21001300221 is a deficient number, since it is larger than the sum of its proper divisors (9546045603).

21001300221 is a wasteful number, since it uses less digits than its factorization.

21001300221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636403051.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21001300221 its reverse (12200310012), we get a palindrome (33201610233).

The spelling of 21001300221 in words is "twenty-one billion, one million, three hundred thousand, two hundred twenty-one".