211212321321 has 4 divisors (see below), whose sum is σ = 281616428432. Its totient is φ = 140808214212.

The previous prime is 211212321293. The next prime is 211212321323. The reversal of 211212321321 is 123123212112.

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 not a de Polignac number, because 211212321321 - 2¹⁹ = 211211797033 is a prime.

It is a super-2 number, since 2×211212321321² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211212321323) 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, 35202053551 + ... + 35202053556.

It is an arithmetic number, because the mean of its divisors is an integer number (70404107108).

Almost surely, 2^211212321321 is an apocalyptic number.

It is an amenable number.

211212321321 is a deficient number, since it is larger than the sum of its proper divisors (70404107111).

211212321321 is an equidigital number, since it uses as much as digits as its factorization.

211212321321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70404107110.

The product of its digits is 288, while the sum is 21.

Adding to 211212321321 its reverse (123123212112), we get a palindrome (334335533433).

The spelling of 211212321321 in words is "two hundred eleven billion, two hundred twelve million, three hundred twenty-one thousand, three hundred twenty-one".