2121000121221 has 8 divisors (see below), whose sum is σ = 2994353112384. Its totient is φ = 1330823605440.

The previous prime is 2121000121211. The next prime is 2121000121241. The reversal of 2121000121221 is 1221210001212.

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

It is a de Polignac number, because none of the positive numbers 2^k-2121000121221 is a prime.

It is a super-4 number, since 4×2121000121221⁴ (a number of 50 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2121000121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121000121211) 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, 20794118785 + ... + 20794118886.

It is an arithmetic number, because the mean of its divisors is an integer number (374294139048).

Almost surely, 2^{2121000121221} is an apocalyptic number.

It is an amenable number.

2121000121221 is a deficient number, since it is larger than the sum of its proper divisors (873352991163).

2121000121221 is a wasteful number, since it uses less digits than its factorization.

2121000121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41588237691.

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

Adding to 2121000121221 its reverse (1221210001212), we get a palindrome (3342210122433).

The spelling of 2121000121221 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-one thousand, two hundred twenty-one".