21133030321 has 16 divisors (see below), whose sum is σ = 23589828864. Its totient is φ = 18807364224.

The previous prime is 21133030291. The next prime is 21133030339. The reversal of 21133030321 is 12303033112.

It is a cyclic number.

It is not a de Polignac number, because 21133030321 - 2¹⁵ = 21132997553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21133030621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 217180 + ... + 299053.

It is an arithmetic number, because the mean of its divisors is an integer number (1474364304).

Almost surely, 2^21133030321 is an apocalyptic number.

It is an amenable number.

21133030321 is a deficient number, since it is larger than the sum of its proper divisors (2456798543).

21133030321 is a wasteful number, since it uses less digits than its factorization.

21133030321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516360.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21133030321 its reverse (12303033112), we get a palindrome (33436063433).

The spelling of 21133030321 in words is "twenty-one billion, one hundred thirty-three million, thirty thousand, three hundred twenty-one".