20021121202100 has 18 divisors (see below), whose sum is σ = 43445833008774. Its totient is φ = 8008448480800.

The previous prime is 20021121202091. The next prime is 20021121202109. The reversal of 20021121202100 is 120212112002.

It is an interprime number because it is at equal distance from previous prime (20021121202091) and next prime (20021121202109).

It can be written as a sum of positive squares in 3 ways, for example, as 394147907344 + 19626973294756 = 627812^2 + 4430234^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021121202109) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 100105605911 + ... + 100105606110.

Almost surely, 2^{20021121202100} is an apocalyptic number.

20021121202100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021121202100 is an abundant number, since it is smaller than the sum of its proper divisors (23424711806674).

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

20021121202100 is a wasteful number, since it uses less digits than its factorization.

20021121202100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200211212035 (or 200211212028 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20021121202100 its reverse (120212112002), we get a palindrome (20141333314102).

It can be divided in two parts, 20021 and 121202100, that added together give a palindrome (121222121).

The spelling of 20021121202100 in words is "twenty trillion, twenty-one billion, one hundred twenty-one million, two hundred two thousand, one hundred".