2021001211221 has 8 divisors (see below), whose sum is σ = 2694696286080. Its totient is φ = 1347320138592.

The previous prime is 2021001211157. The next prime is 2021001211241. The reversal of 2021001211221 is 1221121001202.

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

It is not a de Polignac number, because 2021001211221 - 2⁶ = 2021001211157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2021001211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021001211241) 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, 3159016 + ... + 3744513.

It is an arithmetic number, because the mean of its divisors is an integer number (336837035760).

Almost surely, 2^{2021001211221} is an apocalyptic number.

It is an amenable number.

2021001211221 is a deficient number, since it is larger than the sum of its proper divisors (673695074859).

2021001211221 is an equidigital number, since it uses as much as digits as its factorization.

2021001211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7001115.

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

Adding to 2021001211221 its reverse (1221121001202), we get a palindrome (3242122212423).

The spelling of 2021001211221 in words is "two trillion, twenty-one billion, one million, two hundred eleven thousand, two hundred twenty-one".