20021002101020 has 12 divisors (see below), whose sum is σ = 42044104412184. Its totient is φ = 8008400840400.

The previous prime is 20021002101011. The next prime is 20021002101077. The reversal of 20021002101020 is 2010120012002.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20021002100992 and 20021002101010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 500525052506 + ... + 500525052545.

It is an arithmetic number, because the mean of its divisors is an integer number (3503675367682).

Almost surely, 2^{20021002101020} is an apocalyptic number.

20021002101020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021002101020 is an abundant number, since it is smaller than the sum of its proper divisors (22023102311164).

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

20021002101020 is a wasteful number, since it uses less digits than its factorization.

20021002101020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001050105060 (or 1001050105058 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20021002101020 its reverse (2010120012002), we get a palindrome (22031122113022).

The spelling of 20021002101020 in words is "twenty trillion, twenty-one billion, two million, one hundred one thousand, twenty".