211142041221 has 4 divisors (see below), whose sum is σ = 281522721632. Its totient is φ = 140761360812.

The previous prime is 211142041219. The next prime is 211142041289. The reversal of 211142041221 is 122140241112.

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 211142041221 - 2¹ = 211142041219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211142051221) 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, 35190340201 + ... + 35190340206.

It is an arithmetic number, because the mean of its divisors is an integer number (70380680408).

Almost surely, 2^211142041221 is an apocalyptic number.

It is an amenable number.

211142041221 is a deficient number, since it is larger than the sum of its proper divisors (70380680411).

211142041221 is an equidigital number, since it uses as much as digits as its factorization.

211142041221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70380680410.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 211142041221 its reverse (122140241112), we get a palindrome (333282282333).

The spelling of 211142041221 in words is "two hundred eleven billion, one hundred forty-two million, forty-one thousand, two hundred twenty-one".