21492148847 has 16 divisors (see below), whose sum is σ = 23530504032. Its totient is φ = 19509811200.

The previous prime is 21492148829. The next prime is 21492148859. The reversal of 21492148847 is 74884129412.

It is a cyclic number.

It is not a de Polignac number, because 21492148847 - 2¹⁴ = 21492132463 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21492148795 and 21492148804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21492148807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 502943 + ... + 543999.

It is an arithmetic number, because the mean of its divisors is an integer number (1470656502).

Almost surely, 2^21492148847 is an apocalyptic number.

21492148847 is a deficient number, since it is larger than the sum of its proper divisors (2038355185).

21492148847 is a wasteful number, since it uses less digits than its factorization.

21492148847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41738.

The product of its digits is 1032192, while the sum is 50.

The spelling of 21492148847 in words is "twenty-one billion, four hundred ninety-two million, one hundred forty-eight thousand, eight hundred forty-seven".