21688417383 has 16 divisors (see below), whose sum is σ = 29554937856. Its totient is φ = 14140874720.

The previous prime is 21688417381. The next prime is 21688417409. The reversal of 21688417383 is 38371488612.

It is a cyclic number.

It is not a de Polignac number, because 21688417383 - 2¹ = 21688417381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21688417381) 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, 137578 + ... + 249608.

It is an arithmetic number, because the mean of its divisors is an integer number (1847183616).

Almost surely, 2^21688417383 is an apocalyptic number.

21688417383 is a deficient number, since it is larger than the sum of its proper divisors (7866520473).

21688417383 is a wasteful number, since it uses less digits than its factorization.

21688417383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113454.

The product of its digits is 1548288, while the sum is 51.

The spelling of 21688417383 in words is "twenty-one billion, six hundred eighty-eight million, four hundred seventeen thousand, three hundred eighty-three".