2101211200221 has 24 divisors (see below), whose sum is σ = 3260940040800. Its totient is φ = 1199985266592.

The previous prime is 2101211200181. The next prime is 2101211200303. The reversal of 2101211200221 is 1220021121012.

It is not a de Polignac number, because 2101211200221 - 2¹⁸ = 2101210938077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2101211200221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101211200321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3956826 + ... + 4456331.

It is an arithmetic number, because the mean of its divisors is an integer number (135872501700).

Almost surely, 2^{2101211200221} is an apocalyptic number.

2101211200221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2101211200221 is a deficient number, since it is larger than the sum of its proper divisors (1159728840579).

2101211200221 is a wasteful number, since it uses less digits than its factorization.

2101211200221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8414873 (or 8414866 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2101211200221 its reverse (1220021121012), we get a palindrome (3321232321233).

The spelling of 2101211200221 in words is "two trillion, one hundred one billion, two hundred eleven million, two hundred thousand, two hundred twenty-one".