20200121221 has 8 divisors (see below), whose sum is σ = 23088481920. Its totient is φ = 17312417808.

The previous prime is 20200121209. The next prime is 20200121261. The reversal of 20200121221 is 12212100202.

It is a happy number.

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

It is not a de Polignac number, because 20200121221 - 2⁷ = 20200121093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20200121261) 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, 96601 + ... + 223006.

It is an arithmetic number, because the mean of its divisors is an integer number (2886060240).

Almost surely, 2^20200121221 is an apocalyptic number.

It is an amenable number.

20200121221 is a deficient number, since it is larger than the sum of its proper divisors (2888360699).

20200121221 is an equidigital number, since it uses as much as digits as its factorization.

20200121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328643.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20200121221 its reverse (12212100202), we get a palindrome (32412221423).

The spelling of 20200121221 in words is "twenty billion, two hundred million, one hundred twenty-one thousand, two hundred twenty-one".