21040142321 has 8 divisors (see below), whose sum is σ = 23744361600. Its totient is φ = 18467836240.

The previous prime is 21040142303. The next prime is 21040142329. The reversal of 21040142321 is 12324104012.

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 21040142321 - 2²⁶ = 20973033457 is a prime.

It is a super-3 number, since 3×21040142321³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21040142293 and 21040142302.

It is not an unprimeable number, because it can be changed into a prime (21040142329) 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, 32977961 + ... + 32978598.

It is an arithmetic number, because the mean of its divisors is an integer number (2968045200).

Almost surely, 2^21040142321 is an apocalyptic number.

It is an amenable number.

21040142321 is a deficient number, since it is larger than the sum of its proper divisors (2704219279).

21040142321 is a wasteful number, since it uses less digits than its factorization.

21040142321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65956599.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21040142321 its reverse (12324104012), we get a palindrome (33364246333).

It can be divided in two parts, 21040 and 142321, that added together give a palindrome (163361).

The spelling of 21040142321 in words is "twenty-one billion, forty million, one hundred forty-two thousand, three hundred twenty-one".