20011201121 has 4 divisors (see below), whose sum is σ = 20014372272. Its totient is φ = 20008029972.

The previous prime is 20011201099. The next prime is 20011201163. The reversal of 20011201121 is 12110211002.

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 a de Polignac number, because none of the positive numbers 2^k-20011201121 is a prime.

It is a super-2 number, since 2×20011201121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20011201621) 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, 1576091 + ... + 1588736.

It is an arithmetic number, because the mean of its divisors is an integer number (5003593068).

Almost surely, 2^20011201121 is an apocalyptic number.

It is an amenable number.

20011201121 is a deficient number, since it is larger than the sum of its proper divisors (3171151).

20011201121 is an equidigital number, since it uses as much as digits as its factorization.

20011201121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3171150.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20011201121 its reverse (12110211002), we get a palindrome (32121412123).

The spelling of 20011201121 in words is "twenty billion, eleven million, two hundred one thousand, one hundred twenty-one".