21275266367 has 4 divisors (see below), whose sum is σ = 21280917936. Its totient is φ = 21269614800.

The previous prime is 21275266343. The next prime is 21275266379. The reversal of 21275266367 is 76366257212.

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 21275266367 - 2³⁴ = 4095397183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21275266567) 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, 2820134 + ... + 2827667.

It is an arithmetic number, because the mean of its divisors is an integer number (5320229484).

Almost surely, 2^21275266367 is an apocalyptic number.

21275266367 is a deficient number, since it is larger than the sum of its proper divisors (5651569).

21275266367 is an equidigital number, since it uses as much as digits as its factorization.

21275266367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5651568.

The product of its digits is 1270080, while the sum is 47.

The spelling of 21275266367 in words is "twenty-one billion, two hundred seventy-five million, two hundred sixty-six thousand, three hundred sixty-seven".