2121504534531 has 6 divisors (see below), whose sum is σ = 3064395438780. Its totient is φ = 1414336356348.

The previous prime is 2121504534473. The next prime is 2121504534563. The reversal of 2121504534531 is 1354354051212.

2121504534531 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 50 + 45 + 34 + 531 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-2121504534531 is a prime.

It is a super-2 number, since 2×2121504534531² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2121504534931) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 117861363021 + ... + 117861363038.

It is an arithmetic number, because the mean of its divisors is an integer number (510732573130).

Almost surely, 2^{2121504534531} is an apocalyptic number.

2121504534531 is a deficient number, since it is larger than the sum of its proper divisors (942890904249).

2121504534531 is a wasteful number, since it uses less digits than its factorization.

2121504534531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235722726065 (or 235722726062 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

Adding to 2121504534531 its reverse (1354354051212), we get a palindrome (3475858585743).

The spelling of 2121504534531 in words is "two trillion, one hundred twenty-one billion, five hundred four million, five hundred thirty-four thousand, five hundred thirty-one".