21021210210047 has 2 divisors, whose sum is σ = 21021210210048. Its totient is φ = 21021210210046.

The previous prime is 21021210210001. The next prime is 21021210210103. The reversal of 21021210210047 is 74001201212012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21021210210047 - 2¹⁰ = 21021210209023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21021210210647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510605105023 + 10510605105024.

It is an arithmetic number, because the mean of its divisors is an integer number (10510605105024).

Almost surely, 2^{21021210210047} is an apocalyptic number.

21021210210047 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021210210047 is an equidigital number, since it uses as much as digits as its factorization.

21021210210047 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 23.

Adding to 21021210210047 its reverse (74001201212012), we get a palindrome (95022411422059).

The spelling of 21021210210047 in words is "twenty-one trillion, twenty-one billion, two hundred ten million, two hundred ten thousand, forty-seven".