21519431131 has 8 divisors (see below), whose sum is σ = 23485508928. Its totient is φ = 19554981000.

The previous prime is 21519431111. The next prime is 21519431161. The reversal of 21519431131 is 13113491512.

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 21519431131 - 2⁹ = 21519430619 is a prime.

It is a super-2 number, since 2×21519431131² (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 = 21519431093 and 21519431102.

It is not an unprimeable number, because it can be changed into a prime (21519431111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 379185 + ... + 432226.

It is an arithmetic number, because the mean of its divisors is an integer number (2935688616).

Almost surely, 2^21519431131 is an apocalyptic number.

21519431131 is a deficient number, since it is larger than the sum of its proper divisors (1966077797).

21519431131 is a wasteful number, since it uses less digits than its factorization.

21519431131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 813833.

The product of its digits is 3240, while the sum is 31.

The spelling of 21519431131 in words is "twenty-one billion, five hundred nineteen million, four hundred thirty-one thousand, one hundred thirty-one".