21175425406 has 8 divisors (see below), whose sum is σ = 33434882280. Its totient is φ = 10030464648.

The previous prime is 21175425373. The next prime is 21175425421. The reversal of 21175425406 is 60452457112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21175425406² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278623981 + ... + 278624056.

It is an arithmetic number, because the mean of its divisors is an integer number (4179360285).

Almost surely, 2^21175425406 is an apocalyptic number.

21175425406 is a deficient number, since it is larger than the sum of its proper divisors (12259456874).

21175425406 is a wasteful number, since it uses less digits than its factorization.

21175425406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557248058.

The product of its (nonzero) digits is 67200, while the sum is 37.

The spelling of 21175425406 in words is "twenty-one billion, one hundred seventy-five million, four hundred twenty-five thousand, four hundred six".