21563023411513 has 4 divisors (see below), whose sum is σ = 22697919380560. Its totient is φ = 20428127442468.

The previous prime is 21563023411511. The next prime is 21563023411537. The reversal of 21563023411513 is 31511432036512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21563023411513 - 2¹ = 21563023411511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21563023411511) 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, 567447984495 + ... + 567447984532.

It is an arithmetic number, because the mean of its divisors is an integer number (5674479845140).

Almost surely, 2^{21563023411513} is an apocalyptic number.

It is an amenable number.

21563023411513 is a deficient number, since it is larger than the sum of its proper divisors (1134895969047).

21563023411513 is a wasteful number, since it uses less digits than its factorization.

21563023411513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1134895969046.

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 21563023411513 in words is "twenty-one trillion, five hundred sixty-three billion, twenty-three million, four hundred eleven thousand, five hundred thirteen".