21132430019 has 4 divisors (see below), whose sum is σ = 21478863360. Its totient is φ = 20785996680.

The previous prime is 21132430003. The next prime is 21132430031. The reversal of 21132430019 is 91003423112.

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 21132430019 - 2⁴ = 21132430003 is a prime.

It is a super-2 number, since 2×21132430019² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21132430019.

It is not an unprimeable number, because it can be changed into a prime (21132432019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173216579 + ... + 173216700.

It is an arithmetic number, because the mean of its divisors is an integer number (5369715840).

Almost surely, 2^21132430019 is an apocalyptic number.

21132430019 is a deficient number, since it is larger than the sum of its proper divisors (346433341).

21132430019 is an equidigital number, since it uses as much as digits as its factorization.

21132430019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346433340.

The product of its (nonzero) digits is 1296, while the sum is 26.

The spelling of 21132430019 in words is "twenty-one billion, one hundred thirty-two million, four hundred thirty thousand, nineteen".