640321421321430 has 256 divisors, whose sum is σ = 1814506114176000. Its totient is φ = 160230650038272.

The previous prime is 640321421321429. The next prime is 640321421321473. The reversal of 640321421321430 is 34123124123046.

640321421321430 is a `hidden beast` number, since 6 + 4 + 0 + 3 + 2 + 1 + 4 + 213 + 2 + 1 + 430 = 666.

640321421321430 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 307722384 + ... + 309796236.

It is an arithmetic number, because the mean of its divisors is an integer number (7087914508500).

Almost surely, 2^{640321421321430} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640321421321430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (907253057088000).

640321421321430 is an abundant number, since it is smaller than the sum of its proper divisors (1174184692854570).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640321421321430 is a wasteful number, since it uses less digits than its factorization.

640321421321430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2074460 (or 2074454 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

Adding to 640321421321430 its reverse (34123124123046), we get a palindrome (674444545444476).

The spelling of 640321421321430 in words is "six hundred forty trillion, three hundred twenty-one billion, four hundred twenty-one million, three hundred twenty-one thousand, four hundred thirty".