21271441207 has 2 divisors, whose sum is σ = 21271441208. Its totient is φ = 21271441206.

The previous prime is 21271441181. The next prime is 21271441231. The reversal of 21271441207 is 70214417212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21271441207 is a prime.

It is a super-2 number, since 2×21271441207² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21271441237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10635720603 + 10635720604.

It is an arithmetic number, because the mean of its divisors is an integer number (10635720604).

Almost surely, 2^21271441207 is an apocalyptic number.

21271441207 is a deficient number, since it is larger than the sum of its proper divisors (1).

21271441207 is an equidigital number, since it uses as much as digits as its factorization.

21271441207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6272, while the sum is 31.

Adding to 21271441207 its reverse (70214417212), we get a palindrome (91485858419).

The spelling of 21271441207 in words is "twenty-one billion, two hundred seventy-one million, four hundred forty-one thousand, two hundred seven".