21225007211 has 2 divisors, whose sum is σ = 21225007212. Its totient is φ = 21225007210.

The previous prime is 21225007163. The next prime is 21225007247. The reversal of 21225007211 is 11270052212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21225007211 is a prime.

It is a super-2 number, since 2×21225007211² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21225007261) 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, 10612503605 + 10612503606.

It is an arithmetic number, because the mean of its divisors is an integer number (10612503606).

Almost surely, 2^21225007211 is an apocalyptic number.

21225007211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21225007211 is an equidigital number, since it uses as much as digits as its factorization.

21225007211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 560, while the sum is 23.

Adding to 21225007211 its reverse (11270052212), we get a palindrome (32495059423).

The spelling of 21225007211 in words is "twenty-one billion, two hundred twenty-five million, seven thousand, two hundred eleven".