21272627249 has 2 divisors, whose sum is σ = 21272627250. Its totient is φ = 21272627248.

The previous prime is 21272627219. The next prime is 21272627263. The reversal of 21272627249 is 94272627212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14900596624 + 6372030625 = 122068^2 + 79825^2 .

It is a cyclic number.

It is not a de Polignac number, because 21272627249 - 2¹² = 21272623153 is a prime.

It is not a weakly prime, because it can be changed into another prime (21272627209) 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 as a sum of consecutive naturals, namely, 10636313624 + 10636313625.

It is an arithmetic number, because the mean of its divisors is an integer number (10636313625).

Almost surely, 2^21272627249 is an apocalyptic number.

It is an amenable number.

21272627249 is a deficient number, since it is larger than the sum of its proper divisors (1).

21272627249 is an equidigital number, since it uses as much as digits as its factorization.

21272627249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 44.

The spelling of 21272627249 in words is "twenty-one billion, two hundred seventy-two million, six hundred twenty-seven thousand, two hundred forty-nine".