20201222121021 has 24 divisors (see below), whose sum is σ = 29463239797056. Its totient is φ = 13336548013440.

The previous prime is 20201222121007. The next prime is 20201222121053. The reversal of 20201222121021 is 12012122210202.

It is a happy number.

20201222121021 is a `hidden beast` number, since 202 + 0 + 12 + 221 + 210 + 21 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-20201222121021 is a prime.

It is a super-4 number, since 4×20201222121021⁴ (a number of 54 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20201222120985 and 20201222121003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201222121721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 127284006 + ... + 127442616.

It is an arithmetic number, because the mean of its divisors is an integer number (1227634991544).

Almost surely, 2^{20201222121021} is an apocalyptic number.

It is an amenable number.

20201222121021 is a deficient number, since it is larger than the sum of its proper divisors (9262017676035).

20201222121021 is a wasteful number, since it uses less digits than its factorization.

20201222121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296113 (or 296110 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 20201222121021 its reverse (12012122210202), we get a palindrome (32213344331223).

It can be divided in two parts, 20201 and 222121021, that added together give a palindrome (222141222).

The spelling of 20201222121021 in words is "twenty trillion, two hundred one billion, two hundred twenty-two million, one hundred twenty-one thousand, twenty-one".