21111012001 has 4 divisors (see below), whose sum is σ = 22028882112. Its totient is φ = 20193141892.

The previous prime is 21111011989. The next prime is 21111012019. The reversal of 21111012001 is 10021011112.

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 21111012001 - 2²³ = 21102623393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21111012071) 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, 458935021 + ... + 458935066.

It is an arithmetic number, because the mean of its divisors is an integer number (5507220528).

Almost surely, 2^21111012001 is an apocalyptic number.

It is an amenable number.

21111012001 is a deficient number, since it is larger than the sum of its proper divisors (917870111).

21111012001 is an equidigital number, since it uses as much as digits as its factorization.

21111012001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917870110.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21111012001 its reverse (10021011112), we get a palindrome (31132023113).

The spelling of 21111012001 in words is "twenty-one billion, one hundred eleven million, twelve thousand, one".