21384149065 has 16 divisors (see below), whose sum is σ = 26477160192. Its totient is φ = 16570704384.

The previous prime is 21384149027. The next prime is 21384149117. The reversal of 21384149065 is 56094148312.

It is a cyclic number.

It is not a de Polignac number, because 21384149065 - 2¹³ = 21384140873 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 446259 + ... + 491848.

It is an arithmetic number, because the mean of its divisors is an integer number (1654822512).

Almost surely, 2^21384149065 is an apocalyptic number.

It is an amenable number.

21384149065 is a deficient number, since it is larger than the sum of its proper divisors (5093011127).

21384149065 is an equidigital number, since it uses as much as digits as its factorization.

21384149065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938256.

The product of its (nonzero) digits is 207360, while the sum is 43.

The spelling of 21384149065 in words is "twenty-one billion, three hundred eighty-four million, one hundred forty-nine thousand, sixty-five".