2021121201221 has 8 divisors (see below), whose sum is σ = 2033261289024. Its totient is φ = 2008981560960.

The previous prime is 2021121201139. The next prime is 2021121201241. The reversal of 2021121201221 is 1221021211202.

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-2021121201221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2021121201221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021121201241) 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, 15276926 + ... + 15408656.

It is an arithmetic number, because the mean of its divisors is an integer number (254157661128).

Almost surely, 2^{2021121201221} is an apocalyptic number.

It is an amenable number.

2021121201221 is a deficient number, since it is larger than the sum of its proper divisors (12140087803).

2021121201221 is a wasteful number, since it uses less digits than its factorization.

2021121201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223771.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2021121201221 its reverse (1221021211202), we get a palindrome (3242142412423).

The spelling of 2021121201221 in words is "two trillion, twenty-one billion, one hundred twenty-one million, two hundred one thousand, two hundred twenty-one".