2021121001221 has 8 divisors (see below), whose sum is σ = 3079803430464. Its totient is φ = 1154926286400.

The previous prime is 2021121001217. The next prime is 2021121001261. The reversal of 2021121001221 is 1221001211202.

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

It is not a de Polignac number, because 2021121001221 - 2² = 2021121001217 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2021121001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021121001261) 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, 48121928580 + ... + 48121928621.

It is an arithmetic number, because the mean of its divisors is an integer number (384975428808).

Almost surely, 2^{2021121001221} is an apocalyptic number.

2021121001221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2021121001221 is a deficient number, since it is larger than the sum of its proper divisors (1058682429243).

2021121001221 is an equidigital number, since it uses as much as digits as its factorization.

2021121001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96243857211.

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

Adding to 2021121001221 its reverse (1221001211202), we get a palindrome (3242122212423).

The spelling of 2021121001221 in words is "two trillion, twenty-one billion, one hundred twenty-one million, one thousand, two hundred twenty-one".