20021102100020 has 48 divisors (see below), whose sum is σ = 48491476682880. Its totient is φ = 6801401913984.

The previous prime is 20021102099969. The next prime is 20021102100049. The reversal of 20021102100020 is 2000120112002.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20021102099974 and 20021102100010.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 655984154 + ... + 656014673.

It is an arithmetic number, because the mean of its divisors is an integer number (1010239097560).

Almost surely, 2^{20021102100020} is an apocalyptic number.

20021102100020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021102100020 is an abundant number, since it is smaller than the sum of its proper divisors (28470374582860).

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

20021102100020 is a wasteful number, since it uses less digits than its factorization.

20021102100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1311998952 (or 1311998950 counting only the distinct ones).

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

Adding to 20021102100020 its reverse (2000120112002), we get a palindrome (22021222212022).

The spelling of 20021102100020 in words is "twenty trillion, twenty-one billion, one hundred two million, one hundred thousand, twenty".