210021212231 has 4 divisors (see below), whose sum is σ = 215143680864. Its totient is φ = 204898743600.

The previous prime is 210021212227. The next prime is 210021212239. The reversal of 210021212231 is 132212120012.

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

It is a cyclic number.

It is not a de Polignac number, because 210021212231 - 2² = 210021212227 is a prime.

It is a super-2 number, since 2×210021212231² (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 (210021212239) 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, 2561234255 + ... + 2561234336.

It is an arithmetic number, because the mean of its divisors is an integer number (53785920216).

Almost surely, 2^210021212231 is an apocalyptic number.

210021212231 is a deficient number, since it is larger than the sum of its proper divisors (5122468633).

210021212231 is an equidigital number, since it uses as much as digits as its factorization.

210021212231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5122468632.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 210021212231 its reverse (132212120012), we get a palindrome (342233332243).

The spelling of 210021212231 in words is "two hundred ten billion, twenty-one million, two hundred twelve thousand, two hundred thirty-one".