21234154305 has 32 divisors (see below), whose sum is σ = 41814952704. Its totient is φ = 8960345856.

The previous prime is 21234154261. The next prime is 21234154327. The reversal of 21234154305 is 50345143212.

It is not a de Polignac number, because 21234154305 - 2¹⁶ = 21234088769 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 7776714 + ... + 7779443.

It is an arithmetic number, because the mean of its divisors is an integer number (1306717272).

Almost surely, 2^21234154305 is an apocalyptic number.

It is an amenable number.

21234154305 is a deficient number, since it is larger than the sum of its proper divisors (20580798399).

21234154305 is a wasteful number, since it uses less digits than its factorization.

21234154305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15556185.

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 21234154305 its reverse (50345143212), we get a palindrome (71579297517).

The spelling of 21234154305 in words is "twenty-one billion, two hundred thirty-four million, one hundred fifty-four thousand, three hundred five".