2100201211221 has 8 divisors (see below), whose sum is σ = 2826439013664. Its totient is φ = 1387048774800.

The previous prime is 2100201211217. The next prime is 2100201211231. The reversal of 2100201211221 is 1221121020012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2100201211221 - 2² = 2100201211217 is a prime.

It is a super-2 number, since 2×2100201211221² (a number of 25 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 2100201211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100201211201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3271341130 + ... + 3271341771.

It is an arithmetic number, because the mean of its divisors is an integer number (353304876708).

Almost surely, 2^{2100201211221} is an apocalyptic number.

It is an amenable number.

2100201211221 is a deficient number, since it is larger than the sum of its proper divisors (726237802443).

2100201211221 is a wasteful number, since it uses less digits than its factorization.

2100201211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6542683011.

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

Adding to 2100201211221 its reverse (1221121020012), we get a palindrome (3321322231233).

It can be divided in two parts, 210020 and 1211221, that added together give a palindrome (1421241).

The spelling of 2100201211221 in words is "two trillion, one hundred billion, two hundred one million, two hundred eleven thousand, two hundred twenty-one".