21772046173 has 4 divisors (see below), whose sum is σ = 22917943360. Its totient is φ = 20626148988.

The previous prime is 21772046141. The next prime is 21772046227. The reversal of 21772046173 is 37164027712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21772046173 - 2⁵ = 21772046141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21772046273) 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 3 ways as a sum of consecutive naturals, for example, 572948565 + ... + 572948602.

It is an arithmetic number, because the mean of its divisors is an integer number (5729485840).

Almost surely, 2^21772046173 is an apocalyptic number.

It is an amenable number.

21772046173 is a deficient number, since it is larger than the sum of its proper divisors (1145897187).

21772046173 is a wasteful number, since it uses less digits than its factorization.

21772046173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1145897186.

The product of its (nonzero) digits is 98784, while the sum is 40.

The spelling of 21772046173 in words is "twenty-one billion, seven hundred seventy-two million, forty-six thousand, one hundred seventy-three".