21120221047 has 2 divisors, whose sum is σ = 21120221048. Its totient is φ = 21120221046.

The previous prime is 21120221041. The next prime is 21120221053. The reversal of 21120221047 is 74012202112.

It is a balanced prime because it is at equal distance from previous prime (21120221041) and next prime (21120221053).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21120221047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21120221041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560110523 + 10560110524.

It is an arithmetic number, because the mean of its divisors is an integer number (10560110524).

Almost surely, 2^21120221047 is an apocalyptic number.

21120221047 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120221047 is an equidigital number, since it uses as much as digits as its factorization.

21120221047 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 22.

Adding to 21120221047 its reverse (74012202112), we get a palindrome (95132423159).

The spelling of 21120221047 in words is "twenty-one billion, one hundred twenty million, two hundred twenty-one thousand, forty-seven".