21319364047 has 16 divisors (see below), whose sum is σ = 21621045600. Its totient is φ = 21020313600.

The previous prime is 21319364041. The next prime is 21319364057. The reversal of 21319364047 is 74046391312.

It is a cyclic number.

It is not a de Polignac number, because 21319364047 - 2³ = 21319364039 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 (21319364041) 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, 16138147 + ... + 16139467.

It is an arithmetic number, because the mean of its divisors is an integer number (1351315350).

Almost surely, 2^21319364047 is an apocalyptic number.

21319364047 is a deficient number, since it is larger than the sum of its proper divisors (301681553).

21319364047 is a wasteful number, since it uses less digits than its factorization.

21319364047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2154.

The product of its (nonzero) digits is 108864, while the sum is 40.

The spelling of 21319364047 in words is "twenty-one billion, three hundred nineteen million, three hundred sixty-four thousand, forty-seven".