20210121221020 has 96 divisors (see below), whose sum is σ = 48581404845120. Its totient is φ = 7013255270400.

The previous prime is 20210121220997. The next prime is 20210121221021. The reversal of 20210121221020 is 2012212101202.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20210121220985 and 20210121221003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20210121221021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42038031 + ... + 42516070.

It is an arithmetic number, because the mean of its divisors is an integer number (506056300470).

Almost surely, 2^{20210121221020} is an apocalyptic number.

20210121221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20210121221020 is an abundant number, since it is smaller than the sum of its proper divisors (28371283624100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20210121221020 is a wasteful number, since it uses less digits than its factorization.

20210121221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84554183 (or 84554181 counting only the distinct ones).

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

Adding to 20210121221020 its reverse (2012212101202), we get a palindrome (22222333322222).

The spelling of 20210121221020 in words is "twenty trillion, two hundred ten billion, one hundred twenty-one million, two hundred twenty-one thousand, twenty".