211131201332221 has 4 divisors (see below), whose sum is σ = 220310818781472. Its totient is φ = 201951583882972.

The previous prime is 211131201332201. The next prime is 211131201332243. The reversal of 211131201332221 is 122233102131112.

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 211131201332221 - 2²⁷ = 211131067114493 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 (211131201332201) 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, 4589808724591 + ... + 4589808724636.

It is an arithmetic number, because the mean of its divisors is an integer number (55077704695368).

Almost surely, 2^{211131201332221} is an apocalyptic number.

It is an amenable number.

211131201332221 is a deficient number, since it is larger than the sum of its proper divisors (9179617449251).

211131201332221 is an equidigital number, since it uses as much as digits as its factorization.

211131201332221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9179617449250.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 211131201332221 its reverse (122233102131112), we get a palindrome (333364303463333).

The spelling of 211131201332221 in words is "two hundred eleven trillion, one hundred thirty-one billion, two hundred one million, three hundred thirty-two thousand, two hundred twenty-one".