21113001321 has 8 divisors (see below), whose sum is σ = 28171176960. Its totient is φ = 14065079952.

The previous prime is 21113001307. The next prime is 21113001337. The reversal of 21113001321 is 12310031112.

It is a happy number.

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

It is not a de Polignac number, because 21113001321 - 2⁷ = 21113001193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21113001321.

It is not an unprimeable number, because it can be changed into a prime (21113001361) 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, 2558761 + ... + 2566998.

It is an arithmetic number, because the mean of its divisors is an integer number (3521397120).

Almost surely, 2^21113001321 is an apocalyptic number.

It is an amenable number.

21113001321 is a deficient number, since it is larger than the sum of its proper divisors (7058175639).

21113001321 is a wasteful number, since it uses less digits than its factorization.

21113001321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5127135.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21113001321 its reverse (12310031112), we get a palindrome (33423032433).

The spelling of 21113001321 in words is "twenty-one billion, one hundred thirteen million, one thousand, three hundred twenty-one".