21301221269 has 2 divisors, whose sum is σ = 21301221270. Its totient is φ = 21301221268.

The previous prime is 21301221229. The next prime is 21301221299. The reversal of 21301221269 is 96212210312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18764890225 + 2536331044 = 136985^2 + 50362^2 .

It is a cyclic number.

It is not a de Polignac number, because 21301221269 - 2¹² = 21301217173 is a prime.

It is a super-2 number, since 2×21301221269² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21301221229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650610634 + 10650610635.

It is an arithmetic number, because the mean of its divisors is an integer number (10650610635).

Almost surely, 2^21301221269 is an apocalyptic number.

It is an amenable number.

21301221269 is a deficient number, since it is larger than the sum of its proper divisors (1).

21301221269 is an equidigital number, since it uses as much as digits as its factorization.

21301221269 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The spelling of 21301221269 in words is "twenty-one billion, three hundred one million, two hundred twenty-one thousand, two hundred sixty-nine".