210233434021 has 4 divisors (see below), whose sum is σ = 226405236652. Its totient is φ = 194061631392.

The previous prime is 210233434007. The next prime is 210233434067. The reversal of 210233434021 is 120434332012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 88860629025 + 121372804996 = 298095^2 + 348386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210233434021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210233434091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8085901296 + ... + 8085901321.

It is an arithmetic number, because the mean of its divisors is an integer number (56601309163).

Almost surely, 2^210233434021 is an apocalyptic number.

It is an amenable number.

210233434021 is a deficient number, since it is larger than the sum of its proper divisors (16171802631).

210233434021 is a wasteful number, since it uses less digits than its factorization.

210233434021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16171802630.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 210233434021 its reverse (120434332012), we get a palindrome (330667766033).

The spelling of 210233434021 in words is "two hundred ten billion, two hundred thirty-three million, four hundred thirty-four thousand, twenty-one".