21320403134 has 4 divisors (see below), whose sum is σ = 31980604704. Its totient is φ = 10660201566.

The previous prime is 21320403131. The next prime is 21320403149. The reversal of 21320403134 is 43130402312.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320403131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5330100782 + ... + 5330100785.

It is an arithmetic number, because the mean of its divisors is an integer number (7995151176).

Almost surely, 2^21320403134 is an apocalyptic number.

21320403134 is a deficient number, since it is larger than the sum of its proper divisors (10660201570).

21320403134 is a wasteful number, since it uses less digits than its factorization.

21320403134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10660201569.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21320403134 its reverse (43130402312), we get a palindrome (64450805446).

The spelling of 21320403134 in words is "twenty-one billion, three hundred twenty million, four hundred three thousand, one hundred thirty-four".