20210021001221 has 8 divisors (see below), whose sum is σ = 20243828940288. Its totient is φ = 20176226244000.

The previous prime is 20210021001167. The next prime is 20210021001227. The reversal of 20210021001221 is 12210012001202.

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

It is a cyclic number.

It is not a de Polignac number, because 20210021001221 - 2¹⁴ = 20210020984837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20210021001196 and 20210021001205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20210021001227) 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, 224165 + ... + 6361626.

It is an arithmetic number, because the mean of its divisors is an integer number (2530478617536).

Almost surely, 2^{20210021001221} is an apocalyptic number.

It is an amenable number.

20210021001221 is a deficient number, since it is larger than the sum of its proper divisors (33807939067).

20210021001221 is an equidigital number, since it uses as much as digits as its factorization.

20210021001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6590923.

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

Adding to 20210021001221 its reverse (12210012001202), we get a palindrome (32420033002423).

The spelling of 20210021001221 in words is "twenty trillion, two hundred ten billion, twenty-one million, one thousand, two hundred twenty-one".