20021102002120 has 32 divisors (see below), whose sum is σ = 45785962780920. Its totient is φ = 7877154885120.

The previous prime is 20021102002117. The next prime is 20021102002129. The reversal of 20021102002120 is 2120020112002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11005819520004 + 9015282482116 = 3317502^2 + 3002546^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20021102002120.

It is not an unprimeable number, because it can be changed into a prime (20021102002129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4102682397 + ... + 4102687276.

Almost surely, 2^{20021102002120} is an apocalyptic number.

20021102002120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021102002120 is an abundant number, since it is smaller than the sum of its proper divisors (25764860778800).

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

20021102002120 is a wasteful number, since it uses less digits than its factorization.

20021102002120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8205369745 (or 8205369741 counting only the distinct ones).

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

Adding to 20021102002120 its reverse (2120020112002), we get a palindrome (22141122114122).

The spelling of 20021102002120 in words is "twenty trillion, twenty-one billion, one hundred two million, two thousand, one hundred twenty".