21046663611464 has 8 divisors (see below), whose sum is σ = 39462494271510. Its totient is φ = 10523331805728.

The previous prime is 21046663611461. The next prime is 21046663611511. The reversal of 21046663611464 is 46411636664012.

It can be written as a sum of positive squares in only one way, i.e., 13338988498564 + 7707675112900 = 3652258^2 + 2776270^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (21046663611461) 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 as a sum of consecutive naturals, namely, 1315416475709 + ... + 1315416475724.

Almost surely, 2^{21046663611464} is an apocalyptic number.

It is an amenable number.

21046663611464 is a deficient number, since it is larger than the sum of its proper divisors (18415830660046).

21046663611464 is a wasteful number, since it uses less digits than its factorization.

21046663611464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2630832951439 (or 2630832951435 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 50.

The spelling of 21046663611464 in words is "twenty-one trillion, forty-six billion, six hundred sixty-three million, six hundred eleven thousand, four hundred sixty-four".