21320403135 has 32 divisors (see below), whose sum is σ = 35887104000. Its totient is φ = 10792688256.

The previous prime is 21320403131. The next prime is 21320403149. The reversal of 21320403135 is 53130402312.

It is not a de Polignac number, because 21320403135 - 2² = 21320403131 is a prime.

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 in 31 ways as a sum of consecutive naturals, for example, 389695 + ... + 441024.

It is an arithmetic number, because the mean of its divisors is an integer number (1121472000).

Almost surely, 2^21320403135 is an apocalyptic number.

21320403135 is a deficient number, since it is larger than the sum of its proper divisors (14566700865).

21320403135 is a wasteful number, since it uses less digits than its factorization.

21320403135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830815.

The product of its (nonzero) digits is 2160, while the sum is 24.

Adding to 21320403135 its reverse (53130402312), we get a palindrome (74450805447).

The spelling of 21320403135 in words is "twenty-one billion, three hundred twenty million, four hundred three thousand, one hundred thirty-five".