21842175087 has 6 divisors (see below), whose sum is σ = 31549808472. Its totient is φ = 14561450052.

The previous prime is 21842175041. The next prime is 21842175143. The reversal of 21842175087 is 78057124812.

21842175087 is a `hidden beast` number, since 218 + 421 + 7 + 5 + 0 + 8 + 7 = 666.

It is not a de Polignac number, because 21842175087 - 2¹⁰ = 21842174063 is a prime.

It is a super-2 number, since 2×21842175087² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21842176087) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1213454163 + ... + 1213454180.

It is an arithmetic number, because the mean of its divisors is an integer number (5258301412).

Almost surely, 2^21842175087 is an apocalyptic number.

21842175087 is a deficient number, since it is larger than the sum of its proper divisors (9707633385).

21842175087 is a wasteful number, since it uses less digits than its factorization.

21842175087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2426908349 (or 2426908346 counting only the distinct ones).

The product of its (nonzero) digits is 250880, while the sum is 45.

Adding to 21842175087 its reverse (78057124812), we get a palindrome (99899299899).

The spelling of 21842175087 in words is "twenty-one billion, eight hundred forty-two million, one hundred seventy-five thousand, eighty-seven".