21032134421 has 4 divisors (see below), whose sum is σ = 21946575072. Its totient is φ = 20117693772.

The previous prime is 21032134411. The next prime is 21032134423. The reversal of 21032134421 is 12443123012.

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 a de Polignac number, because none of the positive numbers 2^k-21032134421 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 914440627 = 21032134421 / (2 + 1 + 0 + 3 + 2 + 1 + 3 + 4 + 4 + 2 + 1).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21032134423) 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, 457220291 + ... + 457220336.

It is an arithmetic number, because the mean of its divisors is an integer number (5486643768).

Almost surely, 2^21032134421 is an apocalyptic number.

It is an amenable number.

21032134421 is a deficient number, since it is larger than the sum of its proper divisors (914440651).

21032134421 is an equidigital number, since it uses as much as digits as its factorization.

21032134421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914440650.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21032134421 its reverse (12443123012), we get a palindrome (33475257433).

The spelling of 21032134421 in words is "twenty-one billion, thirty-two million, one hundred thirty-four thousand, four hundred twenty-one".