20200102012121 has 4 divisors (see below), whose sum is σ = 20400103022244. Its totient is φ = 20000101002000.

The previous prime is 20200102012087. The next prime is 20200102012151. The reversal of 20200102012121 is 12121020100202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11436814730896 + 8763287281225 = 3381836^2 + 2960285^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20200102012121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20200102012096 and 20200102012105.

It is not an unprimeable number, because it can be changed into a prime (20200102012151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100000504910 + ... + 100000505111.

It is an arithmetic number, because the mean of its divisors is an integer number (5100025755561).

Almost surely, 2^{20200102012121} is an apocalyptic number.

It is an amenable number.

20200102012121 is a deficient number, since it is larger than the sum of its proper divisors (200001010123).

20200102012121 is a wasteful number, since it uses less digits than its factorization.

20200102012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200001010122.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20200102012121 its reverse (12121020100202), we get a palindrome (32321122112323).

The spelling of 20200102012121 in words is "twenty trillion, two hundred billion, one hundred two million, twelve thousand, one hundred twenty-one".