21120012020047 has 2 divisors, whose sum is σ = 21120012020048. Its totient is φ = 21120012020046.

The previous prime is 21120012020039. The next prime is 21120012020069. The reversal of 21120012020047 is 74002021002112.

It is an a-pointer prime, because the next prime (21120012020069) can be obtained adding 21120012020047 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21120012020047 - 2³ = 21120012020039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21120012020017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560006010023 + 10560006010024.

It is an arithmetic number, because the mean of its divisors is an integer number (10560006010024).

Almost surely, 2^{21120012020047} is an apocalyptic number.

21120012020047 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120012020047 is an equidigital number, since it uses as much as digits as its factorization.

21120012020047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 22.

Adding to 21120012020047 its reverse (74002021002112), we get a palindrome (95122033022159).

The spelling of 21120012020047 in words is "twenty-one trillion, one hundred twenty billion, twelve million, twenty thousand, forty-seven".