210221204434 has 8 divisors (see below), whose sum is σ = 333880736508. Its totient is φ = 98927625600.

The previous prime is 210221204357. The next prime is 210221204437. The reversal of 210221204434 is 434402122012.

It can be written as a sum of positive squares in 2 ways, for example, as 157184496225 + 53036708209 = 396465^2 + 230297^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 210221204399 and 210221204408.

It is not an unprimeable number, because it can be changed into a prime (210221204437) 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, 3091488267 + ... + 3091488334.

Almost surely, 2^210221204434 is an apocalyptic number.

210221204434 is a deficient number, since it is larger than the sum of its proper divisors (123659532074).

210221204434 is a wasteful number, since it uses less digits than its factorization.

210221204434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6182976620.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 210221204434 its reverse (434402122012), we get a palindrome (644623326446).

The spelling of 210221204434 in words is "two hundred ten billion, two hundred twenty-one million, two hundred four thousand, four hundred thirty-four".