20010131221 has 8 divisors (see below), whose sum is σ = 20500671744. Its totient is φ = 19519709280.

The previous prime is 20010131213. The next prime is 20010131237. The reversal of 20010131221 is 12213101002.

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 20010131221 - 2³ = 20010131213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010131201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 380686 + ... + 430048.

It is an arithmetic number, because the mean of its divisors is an integer number (2562583968).

Almost surely, 2^20010131221 is an apocalyptic number.

It is an amenable number.

20010131221 is a deficient number, since it is larger than the sum of its proper divisors (490540523).

20010131221 is an equidigital number, since it uses as much as digits as its factorization.

20010131221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59291.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 20010131221 its reverse (12213101002), we get a palindrome (32223232223).

The spelling of 20010131221 in words is "twenty billion, ten million, one hundred thirty-one thousand, two hundred twenty-one".