21017314047 has 16 divisors (see below), whose sum is σ = 29712821760. Its totient is φ = 13168970112.

The previous prime is 21017314009. The next prime is 21017314057. The reversal of 21017314047 is 74041371012.

It is not a de Polignac number, because 21017314047 - 2⁶ = 21017313983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21017314057) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249913 + ... + 323250.

It is an arithmetic number, because the mean of its divisors is an integer number (1857051360).

Almost surely, 2^21017314047 is an apocalyptic number.

21017314047 is a deficient number, since it is larger than the sum of its proper divisors (8695507713).

21017314047 is a wasteful number, since it uses less digits than its factorization.

21017314047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573902.

The product of its (nonzero) digits is 4704, while the sum is 30.

Adding to 21017314047 its reverse (74041371012), we get a palindrome (95058685059).

The spelling of 21017314047 in words is "twenty-one billion, seventeen million, three hundred fourteen thousand, forty-seven".