10021001022121 has 4 divisors (see below), whose sum is σ = 10071869047812. Its totient is φ = 9970132996432.

The previous prime is 10021001022101. The next prime is 10021001022143. The reversal of 10021001022121 is 12122010012001.

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 9648975438400 + 372025583721 = 3106280^2 + 609939^2 .

It is a cyclic number.

It is not a de Polignac number, because 10021001022121 - 2¹¹ = 10021001020073 is a prime.

It is a super-2 number, since 2×10021001022121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10021001022101) 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, 25434012550 + ... + 25434012943.

It is an arithmetic number, because the mean of its divisors is an integer number (2517967261953).

Almost surely, 2^{10021001022121} is an apocalyptic number.

It is an amenable number.

10021001022121 is a deficient number, since it is larger than the sum of its proper divisors (50868025691).

10021001022121 is an equidigital number, since it uses as much as digits as its factorization.

10021001022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50868025690.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 10021001022121 its reverse (12122010012001), we get a palindrome (22143011034122).

The spelling of 10021001022121 in words is "ten trillion, twenty-one billion, one million, twenty-two thousand, one hundred twenty-one".