21333031107 has 4 divisors (see below), whose sum is σ = 28444041480. Its totient is φ = 14222020736.

The previous prime is 21333031091. The next prime is 21333031169. The reversal of 21333031107 is 70113033312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21333031107 - 2⁴ = 21333031091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21333031177) 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, 3555505182 + ... + 3555505187.

It is an arithmetic number, because the mean of its divisors is an integer number (7111010370).

Almost surely, 2^21333031107 is an apocalyptic number.

21333031107 is a deficient number, since it is larger than the sum of its proper divisors (7111010373).

21333031107 is an equidigital number, since it uses as much as digits as its factorization.

21333031107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7111010372.

The product of its (nonzero) digits is 1134, while the sum is 24.

Adding to 21333031107 its reverse (70113033312), we get a palindrome (91446064419).

The spelling of 21333031107 in words is "twenty-one billion, three hundred thirty-three million, thirty-one thousand, one hundred seven".