20021121200121 has 32 divisors (see below), whose sum is σ = 28324878581760. Its totient is φ = 12543668678016.

The previous prime is 20021121200117. The next prime is 20021121200137. The reversal of 20021121200121 is 12100212112002.

It is not a de Polignac number, because 20021121200121 - 2² = 20021121200117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20021121200121.

It is not an unprimeable number, because it can be changed into a prime (20021121200161) 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, 54885285 + ... + 55248861.

It is an arithmetic number, because the mean of its divisors is an integer number (885152455680).

Almost surely, 2^{20021121200121} is an apocalyptic number.

It is an amenable number.

20021121200121 is a deficient number, since it is larger than the sum of its proper divisors (8303757381639).

20021121200121 is a wasteful number, since it uses less digits than its factorization.

20021121200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371333.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20021121200121 its reverse (12100212112002), we get a palindrome (32121333312123).

The spelling of 20021121200121 in words is "twenty trillion, twenty-one billion, one hundred twenty-one million, two hundred thousand, one hundred twenty-one".