21431352320466 has 256 divisors, whose sum is σ = 48823884103680. Its totient is φ = 6216144480000.

The previous prime is 21431352320453. The next prime is 21431352320551. The reversal of 21431352320466 is 66402325313412.

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, 7847436321 + ... + 7847439051.

It is an arithmetic number, because the mean of its divisors is an integer number (190718297280).

Almost surely, 2^{21431352320466} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21431352320466, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24411942051840).

21431352320466 is an abundant number, since it is smaller than the sum of its proper divisors (27392531783214).

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

21431352320466 is a wasteful number, since it uses less digits than its factorization.

21431352320466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3213.

The product of its (nonzero) digits is 622080, while the sum is 42.

Adding to 21431352320466 its reverse (66402325313412), we get a palindrome (87833677633878).

The spelling of 21431352320466 in words is "twenty-one trillion, four hundred thirty-one billion, three hundred fifty-two million, three hundred twenty thousand, four hundred sixty-six".