632721021 has 8 divisors (see below), whose sum is σ = 845436384. Its totient is φ = 420909840.

The previous prime is 632720993. The next prime is 632721029. The reversal of 632721021 is 120127236.

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

It is not a de Polignac number, because 632721021 - 2⁵ = 632720989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 632720982 and 632721000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (632721029) 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, 224410 + ... + 227211.

It is an arithmetic number, because the mean of its divisors is an integer number (105679548).

Almost surely, 2^632721021 is an apocalyptic number.

It is an amenable number.

632721021 is a deficient number, since it is larger than the sum of its proper divisors (212715363).

632721021 is a wasteful number, since it uses less digits than its factorization.

632721021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452091.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 632721021 is about 25153.9464299342. The cubic root of 632721021 is about 858.4943101182.

Adding to 632721021 its reverse (120127236), we get a palindrome (752848257).

The spelling of 632721021 in words is "six hundred thirty-two million, seven hundred twenty-one thousand, twenty-one".