20001220001201 has 4 divisors (see below), whose sum is σ = 20021903787072. Its totient is φ = 19980536215332.

The previous prime is 20001220001131. The next prime is 20001220001207. The reversal of 20001220001201 is 10210002210002.

It is a happy number.

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 20001220001201 - 2¹⁴ = 20001219984817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20001220001207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10341891485 + ... + 10341893418.

It is an arithmetic number, because the mean of its divisors is an integer number (5005475946768).

Almost surely, 2^{20001220001201} is an apocalyptic number.

It is an amenable number.

20001220001201 is a deficient number, since it is larger than the sum of its proper divisors (20683785871).

20001220001201 is an equidigital number, since it uses as much as digits as its factorization.

20001220001201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20683785870.

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

Adding to 20001220001201 its reverse (10210002210002), we get a palindrome (30211222211203).

The spelling of 20001220001201 in words is "twenty trillion, one billion, two hundred twenty million, one thousand, two hundred one".