10001021221121 has 4 divisors (see below), whose sum is σ = 11429738538432. Its totient is φ = 8572303903812.

The previous prime is 10001021221111. The next prime is 10001021221187. The reversal of 10001021221121 is 12112212010001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10001021221121 - 2³⁰ = 9999947479297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10001021221096 and 10001021221105.

It is not an unprimeable number, because it can be changed into a prime (10001021221111) 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, 714358658645 + ... + 714358658658.

It is an arithmetic number, because the mean of its divisors is an integer number (2857434634608).

Almost surely, 2^{10001021221121} is an apocalyptic number.

It is an amenable number.

10001021221121 is a deficient number, since it is larger than the sum of its proper divisors (1428717317311).

10001021221121 is an equidigital number, since it uses as much as digits as its factorization.

10001021221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1428717317310.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 10001021221121 its reverse (12112212010001), we get a palindrome (22113233231122).

The spelling of 10001021221121 in words is "ten trillion, one billion, twenty-one million, two hundred twenty-one thousand, one hundred twenty-one".