10001220202121 has 4 divisors (see below), whose sum is σ = 10589527272852. Its totient is φ = 9412913131392.

The previous prime is 10001220202109. The next prime is 10001220202139. The reversal of 10001220202121 is 12120202210001.

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 7484951826496 + 2516268375625 = 2735864^2 + 1586275^2 .

It is a cyclic number.

It is not a de Polignac number, because 10001220202121 - 2²² = 10001216007817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10001220202096 and 10001220202105.

It is not an unprimeable number, because it can be changed into a prime (10001220202621) 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, 294153535340 + ... + 294153535373.

It is an arithmetic number, because the mean of its divisors is an integer number (2647381818213).

Almost surely, 2^{10001220202121} is an apocalyptic number.

It is an amenable number.

10001220202121 is a deficient number, since it is larger than the sum of its proper divisors (588307070731).

10001220202121 is an equidigital number, since it uses as much as digits as its factorization.

10001220202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588307070730.

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

Adding to 10001220202121 its reverse (12120202210001), we get a palindrome (22121422412122).

The spelling of 10001220202121 in words is "ten trillion, one billion, two hundred twenty million, two hundred two thousand, one hundred twenty-one".