21510045131 has 8 divisors (see below), whose sum is σ = 21658704000. Its totient is φ = 21361443840.

The previous prime is 21510045091. The next prime is 21510045143. The reversal of 21510045131 is 13154001512.

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-21510045131 is a prime.

It is a super-2 number, since 2×21510045131² (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 = 21510045097 and 21510045106.

It is not an unprimeable number, because it can be changed into a prime (21510045181) 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, 961766 + ... + 983876.

It is an arithmetic number, because the mean of its divisors is an integer number (2707338000).

Almost surely, 2^21510045131 is an apocalyptic number.

21510045131 is a deficient number, since it is larger than the sum of its proper divisors (148658869).

21510045131 is a wasteful number, since it uses less digits than its factorization.

21510045131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28789.

The product of its (nonzero) digits is 600, while the sum is 23.

Adding to 21510045131 its reverse (13154001512), we get a palindrome (34664046643).

The spelling of 21510045131 in words is "twenty-one billion, five hundred ten million, forty-five thousand, one hundred thirty-one".