21120323047 has 2 divisors, whose sum is σ = 21120323048. Its totient is φ = 21120323046.

The previous prime is 21120322991. The next prime is 21120323051. The reversal of 21120323047 is 74032302112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21120323047 - 2⁷ = 21120322919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21120323347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560161523 + 10560161524.

It is an arithmetic number, because the mean of its divisors is an integer number (10560161524).

Almost surely, 2^21120323047 is an apocalyptic number.

21120323047 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120323047 is an equidigital number, since it uses as much as digits as its factorization.

21120323047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 25.

Adding to 21120323047 its reverse (74032302112), we get a palindrome (95152625159).

The spelling of 21120323047 in words is "twenty-one billion, one hundred twenty million, three hundred twenty-three thousand, forty-seven".