21126762547 has 8 divisors (see below), whose sum is σ = 23228854272. Its totient is φ = 19054917000.

The previous prime is 21126762541. The next prime is 21126762593. The reversal of 21126762547 is 74526762112.

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-21126762547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21126762541) 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, 7560079 + ... + 7562872.

It is an arithmetic number, because the mean of its divisors is an integer number (2903606784).

Almost surely, 2^21126762547 is an apocalyptic number.

21126762547 is a deficient number, since it is larger than the sum of its proper divisors (2102091725).

21126762547 is a wasteful number, since it uses less digits than its factorization.

21126762547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15123089.

The product of its digits is 282240, while the sum is 43.

The spelling of 21126762547 in words is "twenty-one billion, one hundred twenty-six million, seven hundred sixty-two thousand, five hundred forty-seven".