21320431034 has 64 divisors (see below), whose sum is σ = 38962010880. Its totient is φ = 8541711360.

The previous prime is 21320431021. The next prime is 21320431057. The reversal of 21320431034 is 43013402312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38976749 + ... + 38977295.

It is an arithmetic number, because the mean of its divisors is an integer number (608781420).

Almost surely, 2^21320431034 is an apocalyptic number.

21320431034 is a deficient number, since it is larger than the sum of its proper divisors (17641579846).

21320431034 is a wasteful number, since it uses less digits than its factorization.

21320431034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1383.

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

Adding to 21320431034 its reverse (43013402312), we get a palindrome (64333833346).

The spelling of 21320431034 in words is "twenty-one billion, three hundred twenty million, four hundred thirty-one thousand, thirty-four".