1000020212121 has 16 divisors (see below), whose sum is σ = 1561007161728. Its totient is φ = 557502556800.

The previous prime is 1000020212077. The next prime is 1000020212189. The reversal of 1000020212121 is 1212120200001.

It is not a de Polignac number, because 1000020212121 - 2²³ = 1000011823513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1000020212097 and 1000020212106.

It is not an unprimeable number, because it can be changed into a prime (1000020212921) 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 15 ways as a sum of consecutive naturals, for example, 580730970 + ... + 580732691.

It is an arithmetic number, because the mean of its divisors is an integer number (97562947608).

Almost surely, 2^{1000020212121} is an apocalyptic number.

It is an amenable number.

1000020212121 is a deficient number, since it is larger than the sum of its proper divisors (560986949607).

1000020212121 is a wasteful number, since it uses less digits than its factorization.

1000020212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1161463712.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1000020212121 its reverse (1212120200001), we get a palindrome (2212140412122).

The spelling of 1000020212121 in words is "one trillion, twenty million, two hundred twelve thousand, one hundred twenty-one".