633423021 has 48 divisors (see below), whose sum is σ = 1076189184. Its totient is φ = 324324000.

The previous prime is 633423019. The next prime is 633423023. The reversal of 633423021 is 120324336.

It is an interprime number because it is at equal distance from previous prime (633423019) and next prime (633423023).

It is not a de Polignac number, because 633423021 - 2¹ = 633423019 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 633422982 and 633423000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (633423023) 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 47 ways as a sum of consecutive naturals, for example, 178656 + ... + 182166.

It is an arithmetic number, because the mean of its divisors is an integer number (22420608).

Almost surely, 2^633423021 is an apocalyptic number.

It is an amenable number.

633423021 is a deficient number, since it is larger than the sum of its proper divisors (442766163).

633423021 is a wasteful number, since it uses less digits than its factorization.

633423021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3614 (or 3603 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 24.

The square root of 633423021 is about 25167.8966344031. The cubic root of 633423021 is about 858.8116907854.

Adding to 633423021 its reverse (120324336), we get a palindrome (753747357).

The spelling of 633423021 in words is "six hundred thirty-three million, four hundred twenty-three thousand, twenty-one".