21026172573 has 24 divisors (see below), whose sum is σ = 34725287168. Its totient is φ = 12009619872.

The previous prime is 21026172571. The next prime is 21026172589. The reversal of 21026172573 is 37527162012.

21026172573 is a `hidden beast` number, since 2 + 10 + 2 + 6 + 1 + 72 + 573 = 666.

It is not a de Polignac number, because 21026172573 - 2¹ = 21026172571 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21026172571) 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 23 ways as a sum of consecutive naturals, for example, 71115 + ... + 217047.

Almost surely, 2^21026172573 is an apocalyptic number.

It is an amenable number.

21026172573 is a deficient number, since it is larger than the sum of its proper divisors (13699114595).

21026172573 is a wasteful number, since it uses less digits than its factorization.

21026172573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148233 (or 148230 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The spelling of 21026172573 in words is "twenty-one billion, twenty-six million, one hundred seventy-two thousand, five hundred seventy-three".