21142034321 has 8 divisors (see below), whose sum is σ = 21716064744. Its totient is φ = 20568142080.

The previous prime is 21142034311. The next prime is 21142034327. The reversal of 21142034321 is 12343024112.

It can be written as a sum of positive squares in 4 ways, for example, as 9572665600 + 11569368721 = 97840^2 + 107561^2 .

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-21142034321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21142034327) 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, 325961 + ... + 385401.

It is an arithmetic number, because the mean of its divisors is an integer number (2714508093).

Almost surely, 2^21142034321 is an apocalyptic number.

It is an amenable number.

21142034321 is a deficient number, since it is larger than the sum of its proper divisors (574030423).

21142034321 is an equidigital number, since it uses as much as digits as its factorization.

21142034321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69091.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21142034321 its reverse (12343024112), we get a palindrome (33485058433).

The spelling of 21142034321 in words is "twenty-one billion, one hundred forty-two million, thirty-four thousand, three hundred twenty-one".