21256132276273 has 4 divisors (see below), whose sum is σ = 21256199754228. Its totient is φ = 21256064798320.

The previous prime is 21256132276271. The next prime is 21256132276319. The reversal of 21256132276273 is 37267223165212.

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

It can be written as a sum of positive squares in 2 ways, for example, as 510721763904 + 20745410512369 = 714648^2 + 4554713^2 .

It is a cyclic number.

It is not a de Polignac number, because 21256132276273 - 2¹ = 21256132276271 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21256132276271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33264238 + ... + 33897223.

It is an arithmetic number, because the mean of its divisors is an integer number (5314049938557).

Almost surely, 2^{21256132276273} is an apocalyptic number.

It is an amenable number.

21256132276273 is a deficient number, since it is larger than the sum of its proper divisors (67477955).

21256132276273 is an equidigital number, since it uses as much as digits as its factorization.

21256132276273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67477954.

The product of its digits is 2540160, while the sum is 49.

The spelling of 21256132276273 in words is "twenty-one trillion, two hundred fifty-six billion, one hundred thirty-two million, two hundred seventy-six thousand, two hundred seventy-three".