475121721 has 24 divisors (see below), whose sum is σ = 651364480. Its totient is φ = 307996416.

The previous prime is 475121711. The next prime is 475121747. The reversal of 475121721 is 127121574.

It is not a de Polignac number, because 475121721 - 2²⁵ = 441567289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (475121701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3026175 + ... + 3026331.

Almost surely, 2^475121721 is an apocalyptic number.

It is an amenable number.

475121721 is a deficient number, since it is larger than the sum of its proper divisors (176242759).

475121721 is a wasteful number, since it uses less digits than its factorization.

475121721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465 (or 352 counting only the distinct ones).

The product of its digits is 3920, while the sum is 30.

The square root of 475121721 is about 21797.2870100845. The cubic root of 475121721 is about 780.3120168530.

The spelling of 475121721 in words is "four hundred seventy-five million, one hundred twenty-one thousand, seven hundred twenty-one".