21729341734 has 16 divisors (see below), whose sum is σ = 34124191920. Its totient is φ = 10363638880.

The previous prime is 21729341671. The next prime is 21729341743. The reversal of 21729341734 is 43714392712.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 2252077 + ... + 2261704.

It is an arithmetic number, because the mean of its divisors is an integer number (2132761995).

Almost surely, 2^21729341734 is an apocalyptic number.

21729341734 is a deficient number, since it is larger than the sum of its proper divisors (12394850186).

21729341734 is a wasteful number, since it uses less digits than its factorization.

21729341734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4513895.

The product of its digits is 254016, while the sum is 43.

The spelling of 21729341734 in words is "twenty-one billion, seven hundred twenty-nine million, three hundred forty-one thousand, seven hundred thirty-four".