20201220012021 has 4 divisors (see below), whose sum is σ = 26934960016032. Its totient is φ = 13467480008012.

The previous prime is 20201220011923. The next prime is 20201220012023. The reversal of 20201220012021 is 12021002210202.

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 20201220012021 - 2⁷ = 20201220011893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201220012023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3366870002001 + ... + 3366870002006.

It is an arithmetic number, because the mean of its divisors is an integer number (6733740004008).

Almost surely, 2^{20201220012021} is an apocalyptic number.

It is an amenable number.

20201220012021 is a deficient number, since it is larger than the sum of its proper divisors (6733740004011).

20201220012021 is an equidigital number, since it uses as much as digits as its factorization.

20201220012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6733740004010.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20201220012021 its reverse (12021002210202), we get a palindrome (32222222222223).

The spelling of 20201220012021 in words is "twenty trillion, two hundred one billion, two hundred twenty million, twelve thousand, twenty-one".