634550021 has 8 divisors (see below), whose sum is σ = 725820480. Its totient is φ = 543434688.

The previous prime is 634549997. The next prime is 634550053. The reversal of 634550021 is 120055436.

634550021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634550021 is a prime.

It is a super-2 number, since 2×634550021² = 805307458302200882, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634550321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29876 + ... + 46493.

It is an arithmetic number, because the mean of its divisors is an integer number (90727560).

Almost surely, 2^634550021 is an apocalyptic number.

It is an amenable number.

634550021 is a deficient number, since it is larger than the sum of its proper divisors (91270459).

634550021 is a wasteful number, since it uses less digits than its factorization.

634550021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77563.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 634550021 is about 25190.2763184527. The cubic root of 634550021 is about 859.3207278140.

The spelling of 634550021 in words is "six hundred thirty-four million, five hundred fifty thousand, twenty-one".