21045534131 has 4 divisors (see below), whose sum is σ = 21045826200. Its totient is φ = 21045242064.

The previous prime is 21045534079. The next prime is 21045534143. The reversal of 21045534131 is 13143554012.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21045534131 - 2¹⁴ = 21045517747 is a prime.

It is a super-2 number, since 2×21045534131² (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 = 21045534094 and 21045534103.

It is not an unprimeable number, because it can be changed into a prime (21045534031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47900 + ... + 210678.

It is an arithmetic number, because the mean of its divisors is an integer number (5261456550).

Almost surely, 2^21045534131 is an apocalyptic number.

21045534131 is a deficient number, since it is larger than the sum of its proper divisors (292069).

21045534131 is a wasteful number, since it uses less digits than its factorization.

21045534131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292068.

The product of its (nonzero) digits is 7200, while the sum is 29.

The spelling of 21045534131 in words is "twenty-one billion, forty-five million, five hundred thirty-four thousand, one hundred thirty-one".