21423321131 has 8 divisors (see below), whose sum is σ = 21612167280. Its totient is φ = 21235284448.

The previous prime is 21423321113. The next prime is 21423321133. The reversal of 21423321131 is 13112332412.

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 21423321131 - 2³⁰ = 20349579307 is a prime.

It is a super-2 number, since 2×21423321131² (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 = 21423321097 and 21423321106.

It is not an unprimeable number, because it can be changed into a prime (21423321133) 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, 149141 + ... + 255126.

It is an arithmetic number, because the mean of its divisors is an integer number (2701520910).

Almost surely, 2^21423321131 is an apocalyptic number.

21423321131 is a deficient number, since it is larger than the sum of its proper divisors (188846149).

21423321131 is a wasteful number, since it uses less digits than its factorization.

21423321131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404733.

The product of its digits is 864, while the sum is 23.

Adding to 21423321131 its reverse (13112332412), we get a palindrome (34535653543).

The spelling of 21423321131 in words is "twenty-one billion, four hundred twenty-three million, three hundred twenty-one thousand, one hundred thirty-one".