20201001221 has 8 divisors (see below), whose sum is σ = 20901550080. Its totient is φ = 19500716592.

The previous prime is 20201001217. The next prime is 20201001241. The reversal of 20201001221 is 12210010202.

It is a happy number.

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 20201001221 - 2² = 20201001217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201001211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96296 + ... + 222878.

It is an arithmetic number, because the mean of its divisors is an integer number (2612693760).

Almost surely, 2^20201001221 is an apocalyptic number.

It is an amenable number.

20201001221 is a deficient number, since it is larger than the sum of its proper divisors (700548859).

20201001221 is a wasteful number, since it uses less digits than its factorization.

20201001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132115.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20201001221 its reverse (12210010202), we get a palindrome (32411011423).

The spelling of 20201001221 in words is "twenty billion, two hundred one million, one thousand, two hundred twenty-one".