16921759730 has 16 divisors (see below), whose sum is σ = 30572403480. Its totient is φ = 6743540352.

The previous prime is 16921759697. The next prime is 16921759741. The reversal of 16921759730 is 3795712961.

It can be written as a sum of positive squares in 4 ways, for example, as 3239544889 + 13682214841 = 56917^2 + 116971^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3142619 + ... + 3147998.

Almost surely, 2^16921759730 is an apocalyptic number.

16921759730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16921759730 is a deficient number, since it is larger than the sum of its proper divisors (13650643750).

16921759730 is a wasteful number, since it uses less digits than its factorization.

16921759730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6290893.

The product of its (nonzero) digits is 714420, while the sum is 50.

The spelling of 16921759730 in words is "sixteen billion, nine hundred twenty-one million, seven hundred fifty-nine thousand, seven hundred thirty".