21340731830 has 32 divisors (see below), whose sum is σ = 41911920288. Its totient is φ = 7759065600.

The previous prime is 21340731779. The next prime is 21340731857. The reversal of 21340731830 is 3813704312.

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 1026014 + ... + 1046606.

It is an arithmetic number, because the mean of its divisors is an integer number (1309747509).

Almost surely, 2^21340731830 is an apocalyptic number.

21340731830 is a deficient number, since it is larger than the sum of its proper divisors (20571188458).

21340731830 is a wasteful number, since it uses less digits than its factorization.

21340731830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30032.

The product of its (nonzero) digits is 12096, while the sum is 32.

The spelling of 21340731830 in words is "twenty-one billion, three hundred forty million, seven hundred thirty-one thousand, eight hundred thirty".