21002213201321 has 8 divisors (see below), whose sum is σ = 23114261996064. Its totient is φ = 18923957187520.

The previous prime is 21002213201317. The next prime is 21002213201441. The reversal of 21002213201321 is 12310231220012.

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

It is not a de Polignac number, because 21002213201321 - 2² = 21002213201317 is a prime.

It is a super-2 number, since 2×21002213201321² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21002213201293 and 21002213201302.

It is not an unprimeable number, because it can be changed into a prime (21002213201521) 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, 8448193931 + ... + 8448196416.

It is an arithmetic number, because the mean of its divisors is an integer number (2889282749508).

Almost surely, 2^{21002213201321} is an apocalyptic number.

It is an amenable number.

21002213201321 is a deficient number, since it is larger than the sum of its proper divisors (2112048794743).

21002213201321 is a wasteful number, since it uses less digits than its factorization.

21002213201321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16896390471.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21002213201321 its reverse (12310231220012), we get a palindrome (33312444421333).

The spelling of 21002213201321 in words is "twenty-one trillion, two billion, two hundred thirteen million, two hundred one thousand, three hundred twenty-one".