20201212012021 has 8 divisors (see below), whose sum is σ = 20387177904600. Its totient is φ = 20015372332032.

The previous prime is 20201212011931. The next prime is 20201212012081. The reversal of 20201212012021 is 12021021210202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2938101099921 + 17263110912100 = 1714089^2 + 4154890^2 .

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 20201212012021 - 2⁹ = 20201212011509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20201212011986 and 20201212012004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201212012081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31231546 + ... + 31871803.

It is an arithmetic number, because the mean of its divisors is an integer number (2548397238075).

Almost surely, 2^{20201212012021} is an apocalyptic number.

It is an amenable number.

20201212012021 is a deficient number, since it is larger than the sum of its proper divisors (185965892579).

20201212012021 is a wasteful number, since it uses less digits than its factorization.

20201212012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63106295.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20201212012021 its reverse (12021021210202), we get a palindrome (32222233222223).

The spelling of 20201212012021 in words is "twenty trillion, two hundred one billion, two hundred twelve million, twelve thousand, twenty-one".