21008292879279 has 4 divisors (see below), whose sum is σ = 28011057172376. Its totient is φ = 14005528586184.

The previous prime is 21008292879271. The next prime is 21008292879319. The reversal of 21008292879279 is 97297829280012.

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

It is not a de Polignac number, because 21008292879279 - 2³ = 21008292879271 is a prime.

It is a super-3 number, since 3×21008292879279³ (a number of 41 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 (21008292879271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3501382146544 + ... + 3501382146549.

It is an arithmetic number, because the mean of its divisors is an integer number (7002764293094).

Almost surely, 2^{21008292879279} is an apocalyptic number.

21008292879279 is a deficient number, since it is larger than the sum of its proper divisors (7002764293097).

21008292879279 is an equidigital number, since it uses as much as digits as its factorization.

21008292879279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7002764293096.

The product of its (nonzero) digits is 36578304, while the sum is 66.

The spelling of 21008292879279 in words is "twenty-one trillion, eight billion, two hundred ninety-two million, eight hundred seventy-nine thousand, two hundred seventy-nine".