16021736929 has 27 divisors (see below), whose sum is σ = 18157882323. Its totient is φ = 14125993200.

The previous prime is 16021736891. The next prime is 16021736999. The reversal of 16021736929 is 92963712061.

It is a happy number.

The square root of 16021736929 is 126577.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 14336470225 + 1685266704 = 119735^2 + 41052^2 .

It is not a de Polignac number, because 16021736929 - 2²³ = 16013348321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16021736999) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 51516684 + ... + 51516994.

Almost surely, 2^16021736929 is an apocalyptic number.

16021736929 is the 126577-th square number.

16021736929 is the 63289-th centered octagonal number.

It is an amenable number.

16021736929 is a deficient number, since it is larger than the sum of its proper divisors (2136145394).

16021736929 is an frugal number, since it uses more digits than its factorization.

16021736929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718 (or 359 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 46.

The spelling of 16021736929 in words is "sixteen billion, twenty-one million, seven hundred thirty-six thousand, nine hundred twenty-nine".