20021001121 has 16 divisors (see below), whose sum is σ = 22674173760. Its totient is φ = 17511117120.

The previous prime is 20021001079. The next prime is 20021001139. The reversal of 20021001121 is 12110012002.

It is a cyclic number.

It is not a de Polignac number, because 20021001121 - 2¹¹ = 20020999073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021001098 and 20021001107.

It is not an unprimeable number, because it can be changed into a prime (20021001151) 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, 20610 + ... + 201163.

It is an arithmetic number, because the mean of its divisors is an integer number (1417135860).

Almost surely, 2^20021001121 is an apocalyptic number.

It is an amenable number.

20021001121 is a deficient number, since it is larger than the sum of its proper divisors (2653172639).

20021001121 is a wasteful number, since it uses less digits than its factorization.

20021001121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222096.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20021001121 its reverse (12110012002), we get a palindrome (32131013123).

The spelling of 20021001121 in words is "twenty billion, twenty-one million, one thousand, one hundred twenty-one".