21030401321 has 8 divisors (see below), whose sum is σ = 21164895360. Its totient is φ = 20895974352.

The previous prime is 21030401299. The next prime is 21030401339. The reversal of 21030401321 is 12310403012.

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 21030401321 - 2²⁶ = 20963292457 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21030401321.

It is not an unprimeable number, because it can be changed into a prime (21030404321) 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, 713015 + ... + 741923.

It is an arithmetic number, because the mean of its divisors is an integer number (2645611920).

Almost surely, 2^21030401321 is an apocalyptic number.

It is an amenable number.

21030401321 is a deficient number, since it is larger than the sum of its proper divisors (134494039).

21030401321 is a wasteful number, since it uses less digits than its factorization.

21030401321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33535.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21030401321 its reverse (12310403012), we get a palindrome (33340804333).

The spelling of 21030401321 in words is "twenty-one billion, thirty million, four hundred one thousand, three hundred twenty-one".