21712182919 has 16 divisors (see below), whose sum is σ = 26081814528. Its totient is φ = 17671338432.

The previous prime is 21712182887. The next prime is 21712182977. The reversal of 21712182919 is 91928121712.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21712182919 - 2⁵ = 21712182887 is a prime.

It is a super-2 number, since 2×21712182919² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21712186919) 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 in 15 ways as a sum of consecutive naturals, for example, 470127 + ... + 514240.

It is an arithmetic number, because the mean of its divisors is an integer number (1630113408).

Almost surely, 2^21712182919 is an apocalyptic number.

21712182919 is a deficient number, since it is larger than the sum of its proper divisors (4369631609).

21712182919 is a wasteful number, since it uses less digits than its factorization.

21712182919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 984534.

The product of its digits is 36288, while the sum is 43.

The spelling of 21712182919 in words is "twenty-one billion, seven hundred twelve million, one hundred eighty-two thousand, nine hundred nineteen".