21007367273 has 4 divisors (see below), whose sum is σ = 21035641728. Its totient is φ = 20979092820.

The previous prime is 21007367261. The next prime is 21007367281. The reversal of 21007367273 is 37276370012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21007367273 - 2¹⁰ = 21007366249 is a prime.

It is a super-2 number, since 2×21007367273² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21007367203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14136113 + ... + 14137598.

It is an arithmetic number, because the mean of its divisors is an integer number (5258910432).

Almost surely, 2^21007367273 is an apocalyptic number.

It is an amenable number.

21007367273 is a deficient number, since it is larger than the sum of its proper divisors (28274455).

21007367273 is an equidigital number, since it uses as much as digits as its factorization.

21007367273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28274454.

The product of its (nonzero) digits is 74088, while the sum is 38.

The spelling of 21007367273 in words is "twenty-one billion, seven million, three hundred sixty-seven thousand, two hundred seventy-three".