210211212031221 has 16 divisors (see below), whose sum is σ = 281492762785920. Its totient is φ = 139536430255680.

The previous prime is 210211212031211. The next prime is 210211212031231. The reversal of 210211212031221 is 122130212112012.

It is an interprime number because it is at equal distance from previous prime (210211212031211) and next prime (210211212031231).

It is not a de Polignac number, because 210211212031221 - 2¹¹ = 210211212029173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210211212031211) 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, 148747090 + ... + 150153651.

It is an arithmetic number, because the mean of its divisors is an integer number (17593297674120).

Almost surely, 2^{210211212031221} is an apocalyptic number.

It is an amenable number.

210211212031221 is a deficient number, since it is larger than the sum of its proper divisors (71281550754699).

210211212031221 is a wasteful number, since it uses less digits than its factorization.

210211212031221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298901756.

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 210211212031221 its reverse (122130212112012), we get a palindrome (332341424143233).

The spelling of 210211212031221 in words is "two hundred ten trillion, two hundred eleven billion, two hundred twelve million, thirty-one thousand, two hundred twenty-one".