63943021 has 8 divisors (see below), whose sum is σ = 65650464. Its totient is φ = 62245680.

The previous prime is 63943007. The next prime is 63943027. The reversal of 63943021 is 12034936.

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-63943021 is a prime.

It is a super-3 number, since 3×63943021³ (a number of 24 digits) contains 333 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 (63943027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11286 + ... + 15976.

It is an arithmetic number, because the mean of its divisors is an integer number (8206308).

Almost surely, 2^63943021 is an apocalyptic number.

It is an amenable number.

63943021 is a deficient number, since it is larger than the sum of its proper divisors (1707443).

63943021 is a wasteful number, since it uses less digits than its factorization.

63943021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5051.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 63943021 is about 7996.4380195184. The cubic root of 63943021 is about 399.8812585046.

Adding to 63943021 its reverse (12034936), we get a palindrome (75977957).

It can be divided in two parts, 639 and 43021, that added together give a triangular number (43660 = T₂₉₅).

The spelling of 63943021 in words is "sixty-three million, nine hundred forty-three thousand, twenty-one".