20021003122121 has 16 divisors (see below), whose sum is σ = 20702722867200. Its totient is φ = 19341530279760.

The previous prime is 20021003122103. The next prime is 20021003122129. The reversal of 20021003122121 is 12122130012002.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20021003122121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20021003122121.

It is not an unprimeable number, because it can be changed into a prime (20021003122129) 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, 397035716 + ... + 397086138.

It is an arithmetic number, because the mean of its divisors is an integer number (1293920179200).

Almost surely, 2^{20021003122121} is an apocalyptic number.

It is an amenable number.

20021003122121 is a deficient number, since it is larger than the sum of its proper divisors (681719745079).

20021003122121 is a wasteful number, since it uses less digits than its factorization.

20021003122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72436.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20021003122121 its reverse (12122130012002), we get a palindrome (32143133134123).

The spelling of 20021003122121 in words is "twenty trillion, twenty-one billion, three million, one hundred twenty-two thousand, one hundred twenty-one".