21712757487 has 8 divisors (see below), whose sum is σ = 28957749936. Its totient is φ = 14471468352.

The previous prime is 21712757483. The next prime is 21712757519. The reversal of 21712757487 is 78475721712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21712757487 - 2² = 21712757483 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21712757483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 912118 + ... + 935619.

It is an arithmetic number, because the mean of its divisors is an integer number (3619718742).

Almost surely, 2^21712757487 is an apocalyptic number.

21712757487 is a deficient number, since it is larger than the sum of its proper divisors (7244992449).

21712757487 is a wasteful number, since it uses less digits than its factorization.

21712757487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1851657.

The product of its digits is 1536640, while the sum is 51.

The spelling of 21712757487 in words is "twenty-one billion, seven hundred twelve million, seven hundred fifty-seven thousand, four hundred eighty-seven".