21333201321 has 8 divisors (see below), whose sum is σ = 28447130880. Its totient is φ = 14220702992.

The previous prime is 21333201283. The next prime is 21333201341. The reversal of 21333201321 is 12310233312.

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 21333201321 - 2⁹ = 21333200809 is a prime.

It is a super-2 number, since 2×21333201321² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21333201341) 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, 322530 + ... + 383003.

It is an arithmetic number, because the mean of its divisors is an integer number (3555891360).

Almost surely, 2^21333201321 is an apocalyptic number.

It is an amenable number.

21333201321 is a deficient number, since it is larger than the sum of its proper divisors (7113929559).

21333201321 is a wasteful number, since it uses less digits than its factorization.

21333201321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715615.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21333201321 its reverse (12310233312), we get a palindrome (33643434633).

The spelling of 21333201321 in words is "twenty-one billion, three hundred thirty-three million, two hundred one thousand, three hundred twenty-one".