21220211147 has 2 divisors, whose sum is σ = 21220211148. Its totient is φ = 21220211146.

The previous prime is 21220211143. The next prime is 21220211149. The reversal of 21220211147 is 74111202212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21220211147 - 2² = 21220211143 is a prime.

It is a super-2 number, since 2×21220211147² (a number of 21 digits) contains 22 as substring.

Together with 21220211149, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21220211141) 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, 10610105573 + 10610105574.

It is an arithmetic number, because the mean of its divisors is an integer number (10610105574).

Almost surely, 2^21220211147 is an apocalyptic number.

21220211147 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220211147 is an equidigital number, since it uses as much as digits as its factorization.

21220211147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 23.

Adding to 21220211147 its reverse (74111202212), we get a palindrome (95331413359).

The spelling of 21220211147 in words is "twenty-one billion, two hundred twenty million, two hundred eleven thousand, one hundred forty-seven".