21000221320213 has 8 divisors (see below), whose sum is σ = 22575825832320. Its totient is φ = 19471649778720.

The previous prime is 21000221320207. The next prime is 21000221320241. The reversal of 21000221320213 is 31202312200012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21000221320213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000221320613) 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, 11758241728 + ... + 11758243513.

It is an arithmetic number, because the mean of its divisors is an integer number (2821978229040).

Almost surely, 2^{21000221320213} is an apocalyptic number.

It is an amenable number.

21000221320213 is a deficient number, since it is larger than the sum of its proper divisors (1575604512107).

21000221320213 is a wasteful number, since it uses less digits than its factorization.

21000221320213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23516485307.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21000221320213 its reverse (31202312200012), we get a palindrome (52202533520225).

The spelling of 21000221320213 in words is "twenty-one trillion, two hundred twenty-one million, three hundred twenty thousand, two hundred thirteen".