20101021200220 has 24 divisors (see below), whose sum is σ = 42927604599600. Its totient is φ = 7904130369792.

The previous prime is 20101021200167. The next prime is 20101021200241. The reversal of 20101021200220 is 2200212010102.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20101021200220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8517380685 + ... + 8517383044.

It is an arithmetic number, because the mean of its divisors is an integer number (1788650191650).

Almost surely, 2^{20101021200220} is an apocalyptic number.

20101021200220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20101021200220 is an abundant number, since it is smaller than the sum of its proper divisors (22826583399380).

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

20101021200220 is a wasteful number, since it uses less digits than its factorization.

20101021200220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17034763797 (or 17034763795 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20101021200220 its reverse (2200212010102), we get a palindrome (22301233210322).

The spelling of 20101021200220 in words is "twenty trillion, one hundred one billion, twenty-one million, two hundred thousand, two hundred twenty".