21234177573 has 32 divisors (see below), whose sum is σ = 34362042624. Its totient is φ = 11386109952.

The previous prime is 21234177571. The next prime is 21234177581. The reversal of 21234177573 is 37577143212.

It is not a de Polignac number, because 21234177573 - 2¹ = 21234177571 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 (21234177571) by changing a digit.

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, 32061 + ... + 208557.

It is an arithmetic number, because the mean of its divisors is an integer number (1073813832).

Almost surely, 2^21234177573 is an apocalyptic number.

It is an amenable number.

21234177573 is a deficient number, since it is larger than the sum of its proper divisors (13127865051).

21234177573 is a wasteful number, since it uses less digits than its factorization.

21234177573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176861.

The product of its digits is 246960, while the sum is 42.

The spelling of 21234177573 in words is "twenty-one billion, two hundred thirty-four million, one hundred seventy-seven thousand, five hundred seventy-three".