630117021 has 4 divisors (see below), whose sum is σ = 840156032. Its totient is φ = 420078012.

The previous prime is 630117011. The next prime is 630117043. The reversal of 630117021 is 120711036.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 630117021 - 2⁵ = 630116989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630117001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105019501 + ... + 105019506.

It is an arithmetic number, because the mean of its divisors is an integer number (210039008).

Almost surely, 2^630117021 is an apocalyptic number.

It is an amenable number.

630117021 is a deficient number, since it is larger than the sum of its proper divisors (210039011).

630117021 is a wasteful number, since it uses less digits than its factorization.

630117021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210039010.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 630117021 is about 25102.1318019008. The cubic root of 630117021 is about 857.3149630635.

Adding to 630117021 its reverse (120711036), we get a palindrome (750828057).

The spelling of 630117021 in words is "six hundred thirty million, one hundred seventeen thousand, twenty-one".