21134560545 has 24 divisors (see below), whose sum is σ = 41866558656. Its totient is φ = 9661513248.

The previous prime is 21134560541. The next prime is 21134560549. The reversal of 21134560545 is 54506543112.

21134560545 is a `hidden beast` number, since 2 + 1 + 1 + 3 + 4 + 5 + 605 + 45 = 666.

It is an interprime number because it is at equal distance from previous prime (21134560541) and next prime (21134560549).

It is not a de Polignac number, because 21134560545 - 2² = 21134560541 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21134560541) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33546607 + ... + 33547236.

It is an arithmetic number, because the mean of its divisors is an integer number (1744439944).

Almost surely, 2^21134560545 is an apocalyptic number.

It is an amenable number.

21134560545 is a deficient number, since it is larger than the sum of its proper divisors (20731998111).

21134560545 is a wasteful number, since it uses less digits than its factorization.

21134560545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67093861 (or 67093858 counting only the distinct ones).

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

The spelling of 21134560545 in words is "twenty-one billion, one hundred thirty-four million, five hundred sixty thousand, five hundred forty-five".