21442152175 has 12 divisors (see below), whose sum is σ = 27987651880. Its totient is φ = 16250893920.

The previous prime is 21442152131. The next prime is 21442152191. The reversal of 21442152175 is 57125124412.

It is not a de Polignac number, because 21442152175 - 2²³ = 21433763567 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21442152175.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22570212 + ... + 22571161.

Almost surely, 2^21442152175 is an apocalyptic number.

21442152175 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21442152175 is a deficient number, since it is larger than the sum of its proper divisors (6545499705).

21442152175 is a wasteful number, since it uses less digits than its factorization.

21442152175 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45141402 (or 45141397 counting only the distinct ones).

The product of its digits is 22400, while the sum is 34.

Adding to 21442152175 its reverse (57125124412), we get a palindrome (78567276587).

The spelling of 21442152175 in words is "twenty-one billion, four hundred forty-two million, one hundred fifty-two thousand, one hundred seventy-five".