26976531221 has 2 divisors, whose sum is σ = 26976531222. Its totient is φ = 26976531220.

The previous prime is 26976531191. The next prime is 26976531223. The reversal of 26976531221 is 12213567962.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26605198321 + 371332900 = 163111^2 + 19270^2 .

It is a cyclic number.

It is not a de Polignac number, because 26976531221 - 2¹⁴ = 26976514837 is a prime.

Together with 26976531223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26976531223) 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 as a sum of consecutive naturals, namely, 13488265610 + 13488265611.

It is an arithmetic number, because the mean of its divisors is an integer number (13488265611).

Almost surely, 2^26976531221 is an apocalyptic number.

It is an amenable number.

26976531221 is a deficient number, since it is larger than the sum of its proper divisors (1).

26976531221 is an equidigital number, since it uses as much as digits as its factorization.

26976531221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 44.

The spelling of 26976531221 in words is "twenty-six billion, nine hundred seventy-six million, five hundred thirty-one thousand, two hundred twenty-one".