21337278367 has 4 divisors (see below), whose sum is σ = 21431275416. Its totient is φ = 21243281320.

The previous prime is 21337278301. The next prime is 21337278371. The reversal of 21337278367 is 76387273312.

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 21337278367 - 2²⁷ = 21203060639 is a prime.

It is a super-2 number, since 2×21337278367² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21337278367.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21337278377) 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, 46998184 + ... + 46998637.

It is an arithmetic number, because the mean of its divisors is an integer number (5357818854).

Almost surely, 2^21337278367 is an apocalyptic number.

21337278367 is a deficient number, since it is larger than the sum of its proper divisors (93997049).

21337278367 is an equidigital number, since it uses as much as digits as its factorization.

21337278367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93997048.

The product of its digits is 1778112, while the sum is 49.

The spelling of 21337278367 in words is "twenty-one billion, three hundred thirty-seven million, two hundred seventy-eight thousand, three hundred sixty-seven".