20001122120021 has 16 divisors (see below), whose sum is σ = 23000425029504. Its totient is φ = 17037600528384.

The previous prime is 20001122120017. The next prime is 20001122120093. The reversal of 20001122120021 is 12002122110002.

It is a cyclic number.

It is not a de Polignac number, because 20001122120021 - 2² = 20001122120017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20001122119978 and 20001122120005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001122120011) 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, 10870796 + ... + 12576821.

It is an arithmetic number, because the mean of its divisors is an integer number (1437526564344).

Almost surely, 2^{20001122120021} is an apocalyptic number.

It is an amenable number.

20001122120021 is a deficient number, since it is larger than the sum of its proper divisors (2999302909483).

20001122120021 is a wasteful number, since it uses less digits than its factorization.

20001122120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23448380.

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

Adding to 20001122120021 its reverse (12002122110002), we get a palindrome (32003244230023).

The spelling of 20001122120021 in words is "twenty trillion, one billion, one hundred twenty-two million, one hundred twenty thousand, twenty-one".