643321221334 has 8 divisors (see below), whose sum is σ = 1052707453128. Its totient is φ = 292418736960.

The previous prime is 643321221313. The next prime is 643321221337. The reversal of 643321221334 is 433122123346.

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

It is a self number, because there is not a number n which added to its sum of digits gives 643321221334.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643321221337) 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, 14620936827 + ... + 14620936870.

It is an arithmetic number, because the mean of its divisors is an integer number (131588431641).

Almost surely, 2^643321221334 is an apocalyptic number.

643321221334 is a deficient number, since it is larger than the sum of its proper divisors (409386231794).

643321221334 is a wasteful number, since it uses less digits than its factorization.

643321221334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29241873710.

The product of its digits is 62208, while the sum is 34.

It can be divided in two parts, 6433212 and 21334, that added together give a palindrome (6454546).

The spelling of 643321221334 in words is "six hundred forty-three billion, three hundred twenty-one million, two hundred twenty-one thousand, three hundred thirty-four".