211514542121221 has 4 divisors (see below), whose sum is σ = 211874873539392. Its totient is φ = 211154210703052.

The previous prime is 211514542121159. The next prime is 211514542121303. The reversal of 211514542121221 is 122121245415112.

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 a cyclic number.

It is not a de Polignac number, because 211514542121221 - 2¹³ = 211514542113029 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 (211514542121321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180165708205 + ... + 180165709378.

It is an arithmetic number, because the mean of its divisors is an integer number (52968718384848).

Almost surely, 2^{211514542121221} is an apocalyptic number.

It is an amenable number.

211514542121221 is a deficient number, since it is larger than the sum of its proper divisors (360331418171).

211514542121221 is an equidigital number, since it uses as much as digits as its factorization.

211514542121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360331418170.

The product of its digits is 12800, while the sum is 34.

Adding to 211514542121221 its reverse (122121245415112), we get a palindrome (333635787536333).

The spelling of 211514542121221 in words is "two hundred eleven trillion, five hundred fourteen billion, five hundred forty-two million, one hundred twenty-one thousand, two hundred twenty-one".