20210120021056 has 224 divisors, whose sum is σ = 48976792064000. Its totient is φ = 8081825476608.

The previous prime is 20210120020997. The next prime is 20210120021057. The reversal of 20210120021056 is 65012002101202.

It is a tau number, because it is divible by the number of its divisors (224).

It is not an unprimeable number, because it can be changed into a prime (20210120021057) 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, 274994491 + ... + 275067973.

Almost surely, 2^{20210120021056} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20210120021056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24488396032000).

20210120021056 is an abundant number, since it is smaller than the sum of its proper divisors (28766672042944).

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

20210120021056 is a wasteful number, since it uses less digits than its factorization.

20210120021056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74009 (or 73999 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 20210120021056 its reverse (65012002101202), we get a palindrome (85222122122258).

The spelling of 20210120021056 in words is "twenty trillion, two hundred ten billion, one hundred twenty million, twenty-one thousand, fifty-six".