21384827564 has 6 divisors (see below), whose sum is σ = 37423448244. Its totient is φ = 10692413780.

The previous prime is 21384827551. The next prime is 21384827567. The reversal of 21384827564 is 46572848312.

It is not an unprimeable number, because it can be changed into a prime (21384827567) 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, 2673103442 + ... + 2673103449.

It is an arithmetic number, because the mean of its divisors is an integer number (6237241374).

Almost surely, 2^21384827564 is an apocalyptic number.

It is an amenable number.

21384827564 is a deficient number, since it is larger than the sum of its proper divisors (16038620680).

21384827564 is a wasteful number, since it uses less digits than its factorization.

21384827564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5346206895 (or 5346206893 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 50.

The spelling of 21384827564 in words is "twenty-one billion, three hundred eighty-four million, eight hundred twenty-seven thousand, five hundred sixty-four".