20201121012021 has 4 divisors (see below), whose sum is σ = 26934828016032. Its totient is φ = 13467414008012.

The previous prime is 20201121011977. The next prime is 20201121012041. The reversal of 20201121012021 is 12021012110202.

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 20201121012021 - 2⁷ = 20201121011893 is a prime.

It is a super-3 number, since 3×20201121012021³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201121012041) 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, 3366853502001 + ... + 3366853502006.

It is an arithmetic number, because the mean of its divisors is an integer number (6733707004008).

Almost surely, 2^{20201121012021} is an apocalyptic number.

It is an amenable number.

20201121012021 is a deficient number, since it is larger than the sum of its proper divisors (6733707004011).

20201121012021 is an equidigital number, since it uses as much as digits as its factorization.

20201121012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6733707004010.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20201121012021 its reverse (12021012110202), we get a palindrome (32222133122223).

The spelling of 20201121012021 in words is "twenty trillion, two hundred one billion, one hundred twenty-one million, twelve thousand, twenty-one".