21363610547 has 4 divisors (see below), whose sum is σ = 21425177496. Its totient is φ = 21302043600.

The previous prime is 21363610501. The next prime is 21363610549. The reversal of 21363610547 is 74501636312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21363610547 - 2⁸ = 21363610291 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21363610547.

It is not an unprimeable number, because it can be changed into a prime (21363610549) 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, 30782954 + ... + 30783647.

It is an arithmetic number, because the mean of its divisors is an integer number (5356294374).

Almost surely, 2^21363610547 is an apocalyptic number.

21363610547 is a deficient number, since it is larger than the sum of its proper divisors (61566949).

21363610547 is an equidigital number, since it uses as much as digits as its factorization.

21363610547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61566948.

The product of its (nonzero) digits is 90720, while the sum is 38.

The spelling of 21363610547 in words is "twenty-one billion, three hundred sixty-three million, six hundred ten thousand, five hundred forty-seven".