211210241221 has 4 divisors (see below), whose sum is σ = 241383132832. Its totient is φ = 181037349612.

The previous prime is 211210241201. The next prime is 211210241251. The reversal of 211210241221 is 122142012112.

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 211210241221 - 2¹¹ = 211210239173 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 (211210241201) 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, 15086445795 + ... + 15086445808.

It is an arithmetic number, because the mean of its divisors is an integer number (60345783208).

Almost surely, 2^211210241221 is an apocalyptic number.

It is an amenable number.

211210241221 is a deficient number, since it is larger than the sum of its proper divisors (30172891611).

211210241221 is an equidigital number, since it uses as much as digits as its factorization.

211210241221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30172891610.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 211210241221 its reverse (122142012112), we get a palindrome (333352253333).

The spelling of 211210241221 in words is "two hundred eleven billion, two hundred ten million, two hundred forty-one thousand, two hundred twenty-one".