21453231307 has 2 divisors, whose sum is σ = 21453231308. Its totient is φ = 21453231306.

The previous prime is 21453231299. The next prime is 21453231409. The reversal of 21453231307 is 70313235412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21453231307 - 2³ = 21453231299 is a prime.

It is a super-2 number, since 2×21453231307² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21453231907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10726615653 + 10726615654.

It is an arithmetic number, because the mean of its divisors is an integer number (10726615654).

Almost surely, 2^21453231307 is an apocalyptic number.

21453231307 is a deficient number, since it is larger than the sum of its proper divisors (1).

21453231307 is an equidigital number, since it uses as much as digits as its factorization.

21453231307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 31.

Adding to 21453231307 its reverse (70313235412), we get a palindrome (91766466719).

The spelling of 21453231307 in words is "twenty-one billion, four hundred fifty-three million, two hundred thirty-one thousand, three hundred seven".