21275940167 has 4 divisors (see below), whose sum is σ = 21438352056. Its totient is φ = 21113528280.

The previous prime is 21275940151. The next prime is 21275940247. The reversal of 21275940167 is 76104957212.

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

It is a cyclic number.

It is not a de Polignac number, because 21275940167 - 2⁴ = 21275940151 is a prime.

It is a super-3 number, since 3×21275940167³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21275940067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81205748 + ... + 81206009.

It is an arithmetic number, because the mean of its divisors is an integer number (5359588014).

Almost surely, 2^21275940167 is an apocalyptic number.

21275940167 is a deficient number, since it is larger than the sum of its proper divisors (162411889).

21275940167 is a wasteful number, since it uses less digits than its factorization.

21275940167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162411888.

The product of its (nonzero) digits is 211680, while the sum is 44.

The spelling of 21275940167 in words is "twenty-one billion, two hundred seventy-five million, nine hundred forty thousand, one hundred sixty-seven".