21363048187 has 4 divisors (see below), whose sum is σ = 23006359600. Its totient is φ = 19719736776.

The previous prime is 21363048173. The next prime is 21363048233. The reversal of 21363048187 is 78184036312.

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 21363048187 - 2¹⁹ = 21362523899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21363048167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 821655687 + ... + 821655712.

It is an arithmetic number, because the mean of its divisors is an integer number (5751589900).

Almost surely, 2^21363048187 is an apocalyptic number.

21363048187 is a deficient number, since it is larger than the sum of its proper divisors (1643311413).

21363048187 is a wasteful number, since it uses less digits than its factorization.

21363048187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1643311412.

The product of its (nonzero) digits is 193536, while the sum is 43.

The spelling of 21363048187 in words is "twenty-one billion, three hundred sixty-three million, forty-eight thousand, one hundred eighty-seven".