211221100031113 has 4 divisors (see below), whose sum is σ = 211438629486288. Its totient is φ = 211003570575940.

The previous prime is 211221100031083. The next prime is 211221100031129. The reversal of 211221100031113 is 311130001122112.

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 211221100031113 - 2²¹ = 211221097933961 is a prime.

It is a super-2 number, since 2×211221100031113² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211221100031143) 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, 108764726131 + ... + 108764728072.

It is an arithmetic number, because the mean of its divisors is an integer number (52859657371572).

Almost surely, 2^{211221100031113} is an apocalyptic number.

It is an amenable number.

211221100031113 is a deficient number, since it is larger than the sum of its proper divisors (217529455175).

211221100031113 is an equidigital number, since it uses as much as digits as its factorization.

211221100031113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217529455174.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 211221100031113 its reverse (311130001122112), we get a palindrome (522351101153225).

The spelling of 211221100031113 in words is "two hundred eleven trillion, two hundred twenty-one billion, one hundred million, thirty-one thousand, one hundred thirteen".