21457317273079 has 8 divisors (see below), whose sum is σ = 22055146718528. Its totient is φ = 20860430035680.

The previous prime is 21457317273059. The next prime is 21457317273089. The reversal of 21457317273079 is 97037271375412.

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-21457317273079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21457317273059) 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, 235505832 + ... + 235596925.

It is an arithmetic number, because the mean of its divisors is an integer number (2756893339816).

Almost surely, 2^{21457317273079} is an apocalyptic number.

21457317273079 is a deficient number, since it is larger than the sum of its proper divisors (597829445449).

21457317273079 is a wasteful number, since it uses less digits than its factorization.

21457317273079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471104025.

The product of its (nonzero) digits is 15558480, while the sum is 58.

The spelling of 21457317273079 in words is "twenty-one trillion, four hundred fifty-seven billion, three hundred seventeen million, two hundred seventy-three thousand, seventy-nine".