21220219147 has 2 divisors, whose sum is σ = 21220219148. Its totient is φ = 21220219146.

The previous prime is 21220219117. The next prime is 21220219157. The reversal of 21220219147 is 74191202212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21220219147 is a prime.

It is not a weakly prime, because it can be changed into another prime (21220219117) 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, 10610109573 + 10610109574.

It is an arithmetic number, because the mean of its divisors is an integer number (10610109574).

Almost surely, 2^21220219147 is an apocalyptic number.

21220219147 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220219147 is an equidigital number, since it uses as much as digits as its factorization.

21220219147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 31.

The spelling of 21220219147 in words is "twenty-one billion, two hundred twenty million, two hundred nineteen thousand, one hundred forty-seven".