21532167723 has 16 divisors (see below), whose sum is σ = 32165991936. Its totient is φ = 12697100640.

The previous prime is 21532167667. The next prime is 21532167731. The reversal of 21532167723 is 32776123512.

It is not a de Polignac number, because 21532167723 - 2¹⁰ = 21532166699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21532167733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8816211 + ... + 8818652.

It is an arithmetic number, because the mean of its divisors is an integer number (2010374496).

Almost surely, 2^21532167723 is an apocalyptic number.

21532167723 is a deficient number, since it is larger than the sum of its proper divisors (10633824213).

21532167723 is a wasteful number, since it uses less digits than its factorization.

21532167723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17634914.

The product of its digits is 105840, while the sum is 39.

The spelling of 21532167723 in words is "twenty-one billion, five hundred thirty-two million, one hundred sixty-seven thousand, seven hundred twenty-three".