210609006221 has 4 divisors (see below), whose sum is σ = 210686467200. Its totient is φ = 210531545244.

The previous prime is 210609006197. The next prime is 210609006227. The reversal of 210609006221 is 122600906012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 210609006221 - 2¹⁰ = 210609005197 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 (210609006227) 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, 38726411 + ... + 38731848.

It is an arithmetic number, because the mean of its divisors is an integer number (52671616800).

Almost surely, 2^210609006221 is an apocalyptic number.

It is an amenable number.

210609006221 is a deficient number, since it is larger than the sum of its proper divisors (77460979).

210609006221 is an equidigital number, since it uses as much as digits as its factorization.

210609006221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77460978.

The product of its (nonzero) digits is 2592, while the sum is 29.

The spelling of 210609006221 in words is "two hundred ten billion, six hundred nine million, six thousand, two hundred twenty-one".