21130211001 has 4 divisors (see below), whose sum is σ = 28173614672. Its totient is φ = 14086807332.

The previous prime is 21130210987. The next prime is 21130211009. The reversal of 21130211001 is 10011203112.

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 not a de Polignac number, because 21130211001 - 2²⁷ = 20995993273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21130211009) 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, 3521701831 + ... + 3521701836.

It is an arithmetic number, because the mean of its divisors is an integer number (7043403668).

Almost surely, 2^21130211001 is an apocalyptic number.

It is an amenable number.

21130211001 is a deficient number, since it is larger than the sum of its proper divisors (7043403671).

21130211001 is an equidigital number, since it uses as much as digits as its factorization.

21130211001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7043403670.

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

Adding to 21130211001 its reverse (10011203112), we get a palindrome (31141414113).

The spelling of 21130211001 in words is "twenty-one billion, one hundred thirty million, two hundred eleven thousand, one".