20012011121 has 8 divisors (see below), whose sum is σ = 20915506920. Its totient is φ = 19122743808.

The previous prime is 20012011109. The next prime is 20012011127. The reversal of 20012011121 is 12111021002.

It can be written as a sum of positive squares in 4 ways, for example, as 9132478096 + 10879533025 = 95564^2 + 104305^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20012011121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20012011127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3554246 + ... + 3559871.

It is an arithmetic number, because the mean of its divisors is an integer number (2614438365).

Almost surely, 2^20012011121 is an apocalyptic number.

It is an amenable number.

20012011121 is a deficient number, since it is larger than the sum of its proper divisors (903495799).

20012011121 is an equidigital number, since it uses as much as digits as its factorization.

20012011121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7114243.

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

Adding to 20012011121 its reverse (12111021002), we get a palindrome (32123032123).

The spelling of 20012011121 in words is "twenty billion, twelve million, eleven thousand, one hundred twenty-one".