10021220200121 has 16 divisors (see below), whose sum is σ = 11057247375888. Its totient is φ = 9023152896000.

The previous prime is 10021220200099. The next prime is 10021220200133. The reversal of 10021220200121 is 12100202212001.

It can be written as a sum of positive squares in 8 ways, for example, as 106152807721 + 9915067392400 = 325811^2 + 3148820^2 .

It is a cyclic number.

It is not a de Polignac number, because 10021220200121 - 2¹⁰ = 10021220199097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10021220200096 and 10021220200105.

It is not an unprimeable number, because it can be changed into a prime (10021220200181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1389665 + ... + 4687601.

It is an arithmetic number, because the mean of its divisors is an integer number (691077960993).

Almost surely, 2^{10021220200121} is an apocalyptic number.

It is an amenable number.

10021220200121 is a deficient number, since it is larger than the sum of its proper divisors (1036027175767).

10021220200121 is a wasteful number, since it uses less digits than its factorization.

10021220200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3303692.

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

Adding to 10021220200121 its reverse (12100202212001), we get a palindrome (22121422412122).

The spelling of 10021220200121 in words is "ten trillion, twenty-one billion, two hundred twenty million, two hundred thousand, one hundred twenty-one".