21716714654 has 4 divisors (see below), whose sum is σ = 32575071984. Its totient is φ = 10858357326.

The previous prime is 21716714627. The next prime is 21716714659. The reversal of 21716714654 is 45641761712.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21716714659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5429178662 + ... + 5429178665.

It is an arithmetic number, because the mean of its divisors is an integer number (8143767996).

Almost surely, 2^21716714654 is an apocalyptic number.

21716714654 is a deficient number, since it is larger than the sum of its proper divisors (10858357330).

21716714654 is a wasteful number, since it uses less digits than its factorization.

21716714654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10858357329.

The product of its digits is 282240, while the sum is 44.

The spelling of 21716714654 in words is "twenty-one billion, seven hundred sixteen million, seven hundred fourteen thousand, six hundred fifty-four".