21721171614 has 32 divisors (see below), whose sum is σ = 43742219136. Its totient is φ = 7190583840.

The previous prime is 21721171607. The next prime is 21721171639. The reversal of 21721171614 is 41617112712.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 488949 + ... + 531519.

It is an arithmetic number, because the mean of its divisors is an integer number (1366944348).

Almost surely, 2^21721171614 is an apocalyptic number.

21721171614 is an abundant number, since it is smaller than the sum of its proper divisors (22021047522).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21721171614 is a wasteful number, since it uses less digits than its factorization.

21721171614 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43160.

The product of its digits is 4704, while the sum is 33.

The spelling of 21721171614 in words is "twenty-one billion, seven hundred twenty-one million, one hundred seventy-one thousand, six hundred fourteen".