2121002111221 has 8 divisors (see below), whose sum is σ = 2447536417664. Its totient is φ = 1800351306000.

The previous prime is 2121002111209. The next prime is 2121002111257. The reversal of 2121002111221 is 1221112001212.

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

It is a cyclic number.

It is not a de Polignac number, because 2121002111221 - 2²³ = 2120993722613 is a prime.

It is a super-2 number, since 2×2121002111221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121002111195 and 2121002111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121002111201) 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, 1470874530 + ... + 1470875971.

It is an arithmetic number, because the mean of its divisors is an integer number (305942052208).

Almost surely, 2^{2121002111221} is an apocalyptic number.

It is an amenable number.

2121002111221 is a deficient number, since it is larger than the sum of its proper divisors (326534306443).

2121002111221 is a wasteful number, since it uses less digits than its factorization.

2121002111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2941750611.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 2121002111221 its reverse (1221112001212), we get a palindrome (3342114112433).

The spelling of 2121002111221 in words is "two trillion, one hundred twenty-one billion, two million, one hundred eleven thousand, two hundred twenty-one".