20021202112121 has 8 divisors (see below), whose sum is σ = 22881412632960. Its totient is φ = 17161001288928.

The previous prime is 20021202112103. The next prime is 20021202112127. The reversal of 20021202112121 is 12121120212002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-20021202112121 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20021202112121.

It is not an unprimeable number, because it can be changed into a prime (20021202112127) 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 7 ways as a sum of consecutive naturals, for example, 2730260 + ... + 6891786.

It is an arithmetic number, because the mean of its divisors is an integer number (2860176579120).

Almost surely, 2^{20021202112121} is an apocalyptic number.

It is an amenable number.

20021202112121 is a deficient number, since it is larger than the sum of its proper divisors (2860210520839).

20021202112121 is an equidigital number, since it uses as much as digits as its factorization.

20021202112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4848823.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20021202112121 its reverse (12121120212002), we get a palindrome (32142322324123).

The spelling of 20021202112121 in words is "twenty trillion, twenty-one billion, two hundred two million, one hundred twelve thousand, one hundred twenty-one".