21234532305 has 64 divisors (see below), whose sum is σ = 40609382400. Its totient is φ = 9264009216.

The previous prime is 21234532283. The next prime is 21234532313. The reversal of 21234532305 is 50323543212.

It is not a de Polignac number, because 21234532305 - 2¹⁰ = 21234531281 is a prime.

It is a super-2 number, since 2×21234532305² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1074544 + ... + 1094126.

It is an arithmetic number, because the mean of its divisors is an integer number (634521600).

Almost surely, 2^21234532305 is an apocalyptic number.

It is an amenable number.

21234532305 is a deficient number, since it is larger than the sum of its proper divisors (19374850095).

21234532305 is a wasteful number, since it uses less digits than its factorization.

21234532305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20070.

The product of its (nonzero) digits is 21600, while the sum is 30.

It can be divided in two parts, 212345 and 32305, that added together give a triangular number (244650 = T₆₉₉).

The spelling of 21234532305 in words is "twenty-one billion, two hundred thirty-four million, five hundred thirty-two thousand, three hundred five".