210021047 has 2 divisors, whose sum is σ = 210021048. Its totient is φ = 210021046.

The previous prime is 210020989. The next prime is 210021067. The reversal of 210021047 is 740120012.

210021047 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 210021047 - 2⁸ = 210020791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210021067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105010523 + 105010524.

It is an arithmetic number, because the mean of its divisors is an integer number (105010524).

Almost surely, 2^210021047 is an apocalyptic number.

210021047 is a deficient number, since it is larger than the sum of its proper divisors (1).

210021047 is an equidigital number, since it uses as much as digits as its factorization.

210021047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 210021047 is about 14492.1029184863. The cubic root of 210021047 is about 594.4120520297.

Adding to 210021047 its reverse (740120012), we get a palindrome (950141059).

The spelling of 210021047 in words is "two hundred ten million, twenty-one thousand, forty-seven".