21133231001 has 4 divisors (see below), whose sum is σ = 21194134032. Its totient is φ = 21072327972.

The previous prime is 21133230991. The next prime is 21133231033. The reversal of 21133231001 is 10013233112.

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 21133231001 - 2³⁴ = 3953361817 is a prime.

It is a super-2 number, since 2×21133231001² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21133231201) 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, 30450995 + ... + 30451688.

It is an arithmetic number, because the mean of its divisors is an integer number (5298533508).

Almost surely, 2^21133231001 is an apocalyptic number.

It is an amenable number.

21133231001 is a deficient number, since it is larger than the sum of its proper divisors (60903031).

21133231001 is an equidigital number, since it uses as much as digits as its factorization.

21133231001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60903030.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21133231001 its reverse (10013233112), we get a palindrome (31146464113).

The spelling of 21133231001 in words is "twenty-one billion, one hundred thirty-three million, two hundred thirty-one thousand, one".