210202122221 has 24 divisors (see below), whose sum is σ = 269454122784. Its totient is φ = 162445983840.

The previous prime is 210202122211. The next prime is 210202122239. The reversal of 210202122221 is 122221202012.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-210202122221 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 210202122221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210202122211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3809675 + ... + 3864456.

It is an arithmetic number, because the mean of its divisors is an integer number (11227255116).

Almost surely, 2^210202122221 is an apocalyptic number.

It is an amenable number.

210202122221 is a deficient number, since it is larger than the sum of its proper divisors (59252000563).

210202122221 is a wasteful number, since it uses less digits than its factorization.

210202122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7674201 (or 7674194 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 210202122221 its reverse (122221202012), we get a palindrome (332423324233).

The spelling of 210202122221 in words is "two hundred ten billion, two hundred two million, one hundred twenty-two thousand, two hundred twenty-one".