21306123514 has 32 divisors (see below), whose sum is σ = 34875025920. Its totient is φ = 9703055232.

The previous prime is 21306123491. The next prime is 21306123521. The reversal of 21306123514 is 41532160312.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5928102 + ... + 5931694.

It is an arithmetic number, because the mean of its divisors is an integer number (1089844560).

Almost surely, 2^21306123514 is an apocalyptic number.

21306123514 is a deficient number, since it is larger than the sum of its proper divisors (13568902406).

21306123514 is a wasteful number, since it uses less digits than its factorization.

21306123514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6574.

The product of its (nonzero) digits is 4320, while the sum is 28.

Adding to 21306123514 its reverse (41532160312), we get a palindrome (62838283826).

The spelling of 21306123514 in words is "twenty-one billion, three hundred six million, one hundred twenty-three thousand, five hundred fourteen".