20021101020121 has 32 divisors (see below), whose sum is σ = 21954187081728. Its totient is φ = 18175965265920.

The previous prime is 20021101020119. The next prime is 20021101020133. The reversal of 20021101020121 is 12102010112002.

It is a cyclic number.

It is not a de Polignac number, because 20021101020121 - 2¹ = 20021101020119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021101020101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 450730905 + ... + 450775321.

It is an arithmetic number, because the mean of its divisors is an integer number (686068346304).

Almost surely, 2^{20021101020121} is an apocalyptic number.

It is an amenable number.

20021101020121 is a deficient number, since it is larger than the sum of its proper divisors (1933086061607).

20021101020121 is a wasteful number, since it uses less digits than its factorization.

20021101020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47241.

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

Adding to 20021101020121 its reverse (12102010112002), we get a palindrome (32123111132123).

The spelling of 20021101020121 in words is "twenty trillion, twenty-one billion, one hundred one million, twenty thousand, one hundred twenty-one".