10021120212121 has 4 divisors (see below), whose sum is σ = 10025095272244. Its totient is φ = 10017145152000.

The previous prime is 10021120212073. The next prime is 10021120212127. The reversal of 10021120212121 is 12121202112001.

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 69082762896 + 9952037449225 = 262836^2 + 3154685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10021120212121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10021120212095 and 10021120212104.

It is not an unprimeable number, because it can be changed into a prime (10021120212127) 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, 1987526280 + ... + 1987531321.

It is an arithmetic number, because the mean of its divisors is an integer number (2506273818061).

Almost surely, 2^{10021120212121} is an apocalyptic number.

It is an amenable number.

10021120212121 is a deficient number, since it is larger than the sum of its proper divisors (3975060123).

10021120212121 is an equidigital number, since it uses as much as digits as its factorization.

10021120212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3975060122.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 10021120212121 its reverse (12121202112001), we get a palindrome (22142322324122).

The spelling of 10021120212121 in words is "ten trillion, twenty-one billion, one hundred twenty million, two hundred twelve thousand, one hundred twenty-one".