20021203000121 has 16 divisors (see below), whose sum is σ = 20936853075600. Its totient is φ = 19121168683008.

The previous prime is 20021203000111. The next prime is 20021203000133. The reversal of 20021203000121 is 12100030212002.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 82477521721 + 19938725478400 = 287189^2 + 4465280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20021203000121 is a prime.

It is a super-2 number, since 2×20021203000121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021203000096 and 20021203000105.

It is not an unprimeable number, because it can be changed into a prime (20021203000111) 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, 3466016 + ... + 7214961.

It is an arithmetic number, because the mean of its divisors is an integer number (1308553317225).

Almost surely, 2^{20021203000121} is an apocalyptic number.

It is an amenable number.

20021203000121 is a deficient number, since it is larger than the sum of its proper divisors (915650075479).

20021203000121 is a wasteful number, since it uses less digits than its factorization.

20021203000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10681708.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 20021203000121 its reverse (12100030212002), we get a palindrome (32121233212123).

The spelling of 20021203000121 in words is "twenty trillion, twenty-one billion, two hundred three million, one hundred twenty-one", and thus it is an aban number.