20123111001 has 8 divisors (see below), whose sum is σ = 30663788224. Its totient is φ = 11498920560.

The previous prime is 20123110979. The next prime is 20123111009. The reversal of 20123111001 is 10011132102.

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

It is not a de Polignac number, because 20123111001 - 2²¹ = 20121013849 is a prime.

It is a super-3 number, since 3×20123111001³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20123111009) 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, 479121670 + ... + 479121711.

It is an arithmetic number, because the mean of its divisors is an integer number (3832973528).

Almost surely, 2^20123111001 is an apocalyptic number.

20123111001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20123111001 is a deficient number, since it is larger than the sum of its proper divisors (10540677223).

20123111001 is an equidigital number, since it uses as much as digits as its factorization.

20123111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 958243391.

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

Adding to 20123111001 its reverse (10011132102), we get a palindrome (30134243103).

The spelling of 20123111001 in words is "twenty billion, one hundred twenty-three million, one hundred eleven thousand, one".