21431201321 has 8 divisors (see below), whose sum is σ = 21548208000. Its totient is φ = 21314288160.

The previous prime is 21431201299. The next prime is 21431201353. The reversal of 21431201321 is 12310213412.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21431201321 is a prime.

It is a super-2 number, since 2×21431201321² (a number of 21 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 = 21431201293 and 21431201302.

It is not an unprimeable number, because it can be changed into a prime (21431201381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 463700 + ... + 507818.

It is an arithmetic number, because the mean of its divisors is an integer number (2693526000).

Almost surely, 2^21431201321 is an apocalyptic number.

It is an amenable number.

21431201321 is a deficient number, since it is larger than the sum of its proper divisors (117006679).

21431201321 is a wasteful number, since it uses less digits than its factorization.

21431201321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46759.

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

Adding to 21431201321 its reverse (12310213412), we get a palindrome (33741414733).

The spelling of 21431201321 in words is "twenty-one billion, four hundred thirty-one million, two hundred one thousand, three hundred twenty-one".