633430630450021 has 8 divisors (see below), whose sum is σ = 635251952595800. Its totient is φ = 631611811842048.

The previous prime is 633430630449943. The next prime is 633430630450043. The reversal of 633430630450021 is 120054036034336.

It can be written as a sum of positive squares in 4 ways, for example, as 236141461941025 + 397289168508996 = 15366895^2 + 19932114^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 633430630450021 - 2⁷ = 633430630449893 is a prime.

It is a super-2 number, since 2×633430630450021² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (633430630450061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 625377696 + ... + 626389753.

It is an arithmetic number, because the mean of its divisors is an integer number (79406494074475).

Almost surely, 2^{633430630450021} is an apocalyptic number.

It is an amenable number.

633430630450021 is a deficient number, since it is larger than the sum of its proper divisors (1821322145779).

633430630450021 is a wasteful number, since it uses less digits than its factorization.

633430630450021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1251768903.

The product of its (nonzero) digits is 466560, while the sum is 40.

Adding to 633430630450021 its reverse (120054036034336), we get a palindrome (753484666484357).

The spelling of 633430630450021 in words is "six hundred thirty-three trillion, four hundred thirty billion, six hundred thirty million, four hundred fifty thousand, twenty-one".