210233210021 has 16 divisors (see below), whose sum is σ = 223354454400. Its totient is φ = 197196822528.

The previous prime is 210233209993. The next prime is 210233210023. The reversal of 210233210021 is 120012332012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210233210021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210233210023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6917966 + ... + 6948288.

It is an arithmetic number, because the mean of its divisors is an integer number (13959653400).

Almost surely, 2^210233210021 is an apocalyptic number.

It is an amenable number.

210233210021 is a deficient number, since it is larger than the sum of its proper divisors (13121244379).

210233210021 is a wasteful number, since it uses less digits than its factorization.

210233210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31708.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 210233210021 its reverse (120012332012), we get a palindrome (330245542033).

The spelling of 210233210021 in words is "two hundred ten billion, two hundred thirty-three million, two hundred ten thousand, twenty-one".