21167645371 has 8 divisors (see below), whose sum is σ = 21395494400. Its totient is φ = 20940752448.

The previous prime is 21167645363. The next prime is 21167645423. The reversal of 21167645371 is 17354676112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21167645371 - 2³ = 21167645363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21167645321) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 194466 + ... + 283111.

It is an arithmetic number, because the mean of its divisors is an integer number (2674436800).

Almost surely, 2^21167645371 is an apocalyptic number.

21167645371 is a deficient number, since it is larger than the sum of its proper divisors (227849029).

21167645371 is a wasteful number, since it uses less digits than its factorization.

21167645371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478053.

The product of its digits is 211680, while the sum is 43.

The spelling of 21167645371 in words is "twenty-one billion, one hundred sixty-seven million, six hundred forty-five thousand, three hundred seventy-one".