20111000001 has 4 divisors (see below), whose sum is σ = 26814666672. Its totient is φ = 13407333332.

The previous prime is 20110999973. The next prime is 20111000003. The reversal of 20111000001 is 10000011102.

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 not a de Polignac number, because 20111000001 - 2¹³ = 20110991809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20111000003) 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, 3351833331 + ... + 3351833336.

It is an arithmetic number, because the mean of its divisors is an integer number (6703666668).

Almost surely, 2^20111000001 is an apocalyptic number.

It is an amenable number.

20111000001 is a deficient number, since it is larger than the sum of its proper divisors (6703666671).

20111000001 is an equidigital number, since it uses as much as digits as its factorization.

20111000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6703666670.

The product of its (nonzero) digits is 2, while the sum is 6.

Adding to 20111000001 its reverse (10000011102), we get a palindrome (30111011103).

The spelling of 20111000001 in words is "twenty billion, one hundred eleven million, one", and thus it is an aban number.