20010011121 has 8 divisors (see below), whose sum is σ = 29644460960. Its totient is φ = 13340007396.

The previous prime is 20010011117. The next prime is 20010011123. The reversal of 20010011121 is 12111001002.

It is a happy number.

It is not a de Polignac number, because 20010011121 - 2² = 20010011117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20010011123) 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, 370555735 + ... + 370555788.

It is an arithmetic number, because the mean of its divisors is an integer number (3705557620).

Almost surely, 2^20010011121 is an apocalyptic number.

It is an amenable number.

20010011121 is a deficient number, since it is larger than the sum of its proper divisors (9634449839).

20010011121 is an equidigital number, since it uses as much as digits as its factorization.

20010011121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 741111532 (or 741111526 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 20010011121 its reverse (12111001002), we get a palindrome (32121012123).

The spelling of 20010011121 in words is "twenty billion, ten million, eleven thousand, one hundred twenty-one".