20011121120121 has 64 divisors (see below), whose sum is σ = 28916107100160. Its totient is φ = 12268195200000.

The previous prime is 20011121120117. The next prime is 20011121120173. The reversal of 20011121120121 is 12102112111002.

It is a happy number.

It is not a de Polignac number, because 20011121120121 - 2² = 20011121120117 is a prime.

It is a super-2 number, since 2×20011121120121² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20011121120121.

It is not an unprimeable number, because it can be changed into a prime (20011121120621) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 475607541 + ... + 475649613.

It is an arithmetic number, because the mean of its divisors is an integer number (451814173440).

Almost surely, 2^{20011121120121} is an apocalyptic number.

It is an amenable number.

20011121120121 is a deficient number, since it is larger than the sum of its proper divisors (8904985980039).

20011121120121 is a wasteful number, since it uses less digits than its factorization.

20011121120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43158.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 20011121120121 its reverse (12102112111002), we get a palindrome (32113233231123).

The spelling of 20011121120121 in words is "twenty trillion, eleven billion, one hundred twenty-one million, one hundred twenty thousand, one hundred twenty-one".