20110021200121 has 4 divisors (see below), whose sum is σ = 20268367823872. Its totient is φ = 19951674576372.

The previous prime is 20110021200107. The next prime is 20110021200127. The reversal of 20110021200121 is 12100212001102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20110021200121 - 2¹³ = 20110021191929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20110021200127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79173311685 + ... + 79173311938.

It is an arithmetic number, because the mean of its divisors is an integer number (5067091955968).

Almost surely, 2^{20110021200121} is an apocalyptic number.

It is an amenable number.

20110021200121 is a deficient number, since it is larger than the sum of its proper divisors (158346623751).

20110021200121 is a wasteful number, since it uses less digits than its factorization.

20110021200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158346623750.

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

Adding to 20110021200121 its reverse (12100212001102), we get a palindrome (32210233201223).

It can be divided in two parts, 2011002 and 1200121, that added together give a palindrome (3211123).

The spelling of 20110021200121 in words is "twenty trillion, one hundred ten billion, twenty-one million, two hundred thousand, one hundred twenty-one".