2021000121221 has 8 divisors (see below), whose sum is σ = 2024324287488. Its totient is φ = 2017678680000.

The previous prime is 2021000121199. The next prime is 2021000121251. The reversal of 2021000121221 is 1221210001202.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021000121221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021000121196 and 2021000121205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021000121251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 805901 + ... + 2165981.

It is an arithmetic number, because the mean of its divisors is an integer number (253040535936).

Almost surely, 2^{2021000121221} is an apocalyptic number.

It is an amenable number.

2021000121221 is a deficient number, since it is larger than the sum of its proper divisors (3324166267).

2021000121221 is a wasteful number, since it uses less digits than its factorization.

2021000121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1362523.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2021000121221 its reverse (1221210001202), we get a palindrome (3242210122423).

The spelling of 2021000121221 in words is "two trillion, twenty-one billion, one hundred twenty-one thousand, two hundred twenty-one".