21210012011047 has 2 divisors, whose sum is σ = 21210012011048. Its totient is φ = 21210012011046.

The previous prime is 21210012010939. The next prime is 21210012011107. The reversal of 21210012011047 is 74011021001212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21210012011047 - 2¹⁵ = 21210011978279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21210012051047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605006005523 + 10605006005524.

It is an arithmetic number, because the mean of its divisors is an integer number (10605006005524).

Almost surely, 2^{21210012011047} is an apocalyptic number.

21210012011047 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210012011047 is an equidigital number, since it uses as much as digits as its factorization.

21210012011047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 22.

Adding to 21210012011047 its reverse (74011021001212), we get a palindrome (95221033012259).

The spelling of 21210012011047 in words is "twenty-one trillion, two hundred ten billion, twelve million, eleven thousand, forty-seven".