21430451013 has 4 divisors (see below), whose sum is σ = 28573934688. Its totient is φ = 14286967340.

The previous prime is 21430450991. The next prime is 21430451027. The reversal of 21430451013 is 31015403412.

It is a happy number.

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 21430451013 - 2⁵ = 21430450981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21430451083) 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, 3571741833 + ... + 3571741838.

It is an arithmetic number, because the mean of its divisors is an integer number (7143483672).

Almost surely, 2^21430451013 is an apocalyptic number.

It is an amenable number.

21430451013 is a deficient number, since it is larger than the sum of its proper divisors (7143483675).

21430451013 is an equidigital number, since it uses as much as digits as its factorization.

21430451013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7143483674.

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 21430451013 its reverse (31015403412), we get a palindrome (52445854425).

The spelling of 21430451013 in words is "twenty-one billion, four hundred thirty million, four hundred fifty-one thousand, thirteen".