211210220311221 has 16 divisors (see below), whose sum is σ = 282824816339520. Its totient is φ = 140201229797760.

The previous prime is 211210220311183. The next prime is 211210220311249. The reversal of 211210220311221 is 122113022012112.

It is not a de Polignac number, because 211210220311221 - 2⁹ = 211210220310709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211210220311291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79768090 + ... + 82373348.

It is an arithmetic number, because the mean of its divisors is an integer number (17676551021220).

Almost surely, 2^{211210220311221} is an apocalyptic number.

It is an amenable number.

211210220311221 is a deficient number, since it is larger than the sum of its proper divisors (71614596028299).

211210220311221 is a wasteful number, since it uses less digits than its factorization.

211210220311221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2721476.

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 211210220311221 its reverse (122113022012112), we get a palindrome (333323242323333).

The spelling of 211210220311221 in words is "two hundred eleven trillion, two hundred ten billion, two hundred twenty million, three hundred eleven thousand, two hundred twenty-one".