211221100203213 has 32 divisors (see below), whose sum is σ = 307815404774400. Its totient is φ = 128254974382080.

The previous prime is 211221100203199. The next prime is 211221100203229. The reversal of 211221100203213 is 312302001122112.

It is not a de Polignac number, because 211221100203213 - 2⁵ = 211221100203181 is a prime.

It is a super-2 number, since 2×211221100203213² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211221100203213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221100207213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 454224481 + ... + 454689257.

It is an arithmetic number, because the mean of its divisors is an integer number (9619231399200).

Almost surely, 2^{211221100203213} is an apocalyptic number.

It is an amenable number.

211221100203213 is a deficient number, since it is larger than the sum of its proper divisors (96594304571187).

211221100203213 is a wasteful number, since it uses less digits than its factorization.

211221100203213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 752277.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 211221100203213 its reverse (312302001122112), we get a palindrome (523523101325325).

The spelling of 211221100203213 in words is "two hundred eleven trillion, two hundred twenty-one billion, one hundred million, two hundred three thousand, two hundred thirteen".