21464461252663 has 16 divisors (see below), whose sum is σ = 25217119620000. Its totient is φ = 18012042334080.

The previous prime is 21464461252573. The next prime is 21464461252669. The reversal of 21464461252663 is 36625216446412.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21464461252663 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21464461252663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21464461252669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55162713 + ... + 55550461.

It is an arithmetic number, because the mean of its divisors is an integer number (1576069976250).

Almost surely, 2^{21464461252663} is an apocalyptic number.

21464461252663 is a deficient number, since it is larger than the sum of its proper divisors (3752658367337).

21464461252663 is a wasteful number, since it uses less digits than its factorization.

21464461252663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774882.

The product of its digits is 9953280, while the sum is 52.

The spelling of 21464461252663 in words is "twenty-one trillion, four hundred sixty-four billion, four hundred sixty-one million, two hundred fifty-two thousand, six hundred sixty-three".