21534065445 has 16 divisors (see below), whose sum is σ = 35952527232. Its totient is φ = 10985494080.

The previous prime is 21534065389. The next prime is 21534065447. The reversal of 21534065445 is 54456043512.

It is not a de Polignac number, because 21534065445 - 2¹² = 21534061349 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21534065447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31208446 + ... + 31209135.

It is an arithmetic number, because the mean of its divisors is an integer number (2247032952).

Almost surely, 2^21534065445 is an apocalyptic number.

It is an amenable number.

21534065445 is a deficient number, since it is larger than the sum of its proper divisors (14418461787).

21534065445 is a wasteful number, since it uses less digits than its factorization.

21534065445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62417612.

The product of its (nonzero) digits is 288000, while the sum is 39.

The spelling of 21534065445 in words is "twenty-one billion, five hundred thirty-four million, sixty-five thousand, four hundred forty-five".