20121001010221 has 4 divisors (see below), whose sum is σ = 20186541730432. Its totient is φ = 20055460290012.

The previous prime is 20121001010179. The next prime is 20121001010237. The reversal of 20121001010221 is 12201010012102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20121001010221 - 2⁴³ = 11324907988013 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 (20121041010221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32770359645 + ... + 32770360258.

It is an arithmetic number, because the mean of its divisors is an integer number (5046635432608).

Almost surely, 2^{20121001010221} is an apocalyptic number.

It is an amenable number.

20121001010221 is a deficient number, since it is larger than the sum of its proper divisors (65540720211).

20121001010221 is an equidigital number, since it uses as much as digits as its factorization.

20121001010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65540720210.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20121001010221 its reverse (12201010012102), we get a palindrome (32322011022323).

The spelling of 20121001010221 in words is "twenty trillion, one hundred twenty-one billion, one million, ten thousand, two hundred twenty-one".