210221213231 has 16 divisors (see below), whose sum is σ = 215434749600. Its totient is φ = 205081901568.

The previous prime is 210221213221. The next prime is 210221213243. The reversal of 210221213231 is 132312122012.

It is a cyclic number.

It is not a de Polignac number, because 210221213231 - 2¹⁰ = 210221212207 is a prime.

It is a super-2 number, since 2×210221213231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210221213221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2691035 + ... + 2768051.

It is an arithmetic number, because the mean of its divisors is an integer number (13464671850).

Almost surely, 2^210221213231 is an apocalyptic number.

210221213231 is a deficient number, since it is larger than the sum of its proper divisors (5213536369).

210221213231 is a wasteful number, since it uses less digits than its factorization.

210221213231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77498.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 210221213231 its reverse (132312122012), we get a palindrome (342533335243).

The spelling of 210221213231 in words is "two hundred ten billion, two hundred twenty-one million, two hundred thirteen thousand, two hundred thirty-one".