2121000211221 has 16 divisors (see below), whose sum is σ = 2910348138048. Its totient is φ = 1372981881600.

The previous prime is 2121000211199. The next prime is 2121000211277. The reversal of 2121000211221 is 1221120001212.

It is not a de Polignac number, because 2121000211221 - 2⁷ = 2121000211093 is a prime.

It is a super-2 number, since 2×2121000211221² (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 2121000211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121000216221) 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, 19403860 + ... + 19512861.

It is an arithmetic number, because the mean of its divisors is an integer number (181896758628).

Almost surely, 2^{2121000211221} is an apocalyptic number.

It is an amenable number.

2121000211221 is a deficient number, since it is larger than the sum of its proper divisors (789347926827).

2121000211221 is a wasteful number, since it uses less digits than its factorization.

2121000211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38917252.

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

Adding to 2121000211221 its reverse (1221120001212), we get a palindrome (3342120212433).

The spelling of 2121000211221 in words is "two trillion, one hundred twenty-one billion, two hundred eleven thousand, two hundred twenty-one".