21310004321 has 8 divisors (see below), whose sum is σ = 22239415680. Its totient is φ = 20380833792.

The previous prime is 21310004293. The next prime is 21310004329. The reversal of 21310004321 is 12340001312.

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 21310004321 - 2²² = 21305810017 is a prime.

It is a super-2 number, since 2×21310004321² (a number of 21 digits) contains 22 as substring.

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 21310004321.

It is not an unprimeable number, because it can be changed into a prime (21310004329) 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, 133985 + ... + 246113.

It is an arithmetic number, because the mean of its divisors is an integer number (2779926960).

Almost surely, 2^21310004321 is an apocalyptic number.

It is an amenable number.

21310004321 is a deficient number, since it is larger than the sum of its proper divisors (929411359).

21310004321 is a wasteful number, since it uses less digits than its factorization.

21310004321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120415.

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

Adding to 21310004321 its reverse (12340001312), we get a palindrome (33650005633).

The spelling of 21310004321 in words is "twenty-one billion, three hundred ten million, four thousand, three hundred twenty-one".