20011121121 has 8 divisors (see below), whose sum is σ = 26704441440. Its totient is φ = 13329274112.

The previous prime is 20011121113. The next prime is 20011121129. The reversal of 20011121121 is 12112111002.

It is an interprime number because it is at equal distance from previous prime (20011121113) and next prime (20011121129).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20011121121 - 2³ = 20011121113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20011121097 and 20011121106.

It is not an unprimeable number, because it can be changed into a prime (20011121129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2864256 + ... + 2871233.

It is an arithmetic number, because the mean of its divisors is an integer number (3338055180).

Almost surely, 2^20011121121 is an apocalyptic number.

It is an amenable number.

20011121121 is a deficient number, since it is larger than the sum of its proper divisors (6693320319).

20011121121 is a wasteful number, since it uses less digits than its factorization.

20011121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5736655.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20011121121 its reverse (12112111002), we get a palindrome (32123232123).

The spelling of 20011121121 in words is "twenty billion, eleven million, one hundred twenty-one thousand, one hundred twenty-one".