20021002102120 has 64 divisors (see below), whose sum is σ = 45811996070400. Its totient is φ = 7872454106880.

The previous prime is 20021002102067. The next prime is 20021002102121. The reversal of 20021002102120 is 2120120012002.

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 20021002102120.

It is not an unprimeable number, because it can be changed into a prime (20021002102121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110822665 + ... + 111003175.

It is an arithmetic number, because the mean of its divisors is an integer number (715812438600).

Almost surely, 2^{20021002102120} is an apocalyptic number.

20021002102120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021002102120 is an abundant number, since it is smaller than the sum of its proper divisors (25790993968280).

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

20021002102120 is a wasteful number, since it uses less digits than its factorization.

20021002102120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227578 (or 227574 counting only the distinct ones).

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

Adding to 20021002102120 its reverse (2120120012002), we get a palindrome (22141122114122).

The spelling of 20021002102120 in words is "twenty trillion, twenty-one billion, two million, one hundred two thousand, one hundred twenty".