16407854536921 has 9 divisors (see below), whose sum is σ = 16427032490421. Its totient is φ = 16388698961052.

The previous prime is 16407854536903. The next prime is 16407854536951. The reversal of 16407854536921 is 12963545870461.

The square root of 16407854536921 is 4050661.

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

16407854536921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 16407854536921 - 2⁵ = 16407854536889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16407854536921.

It is not an unprimeable number, because it can be changed into a prime (16407854536951) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4548890500 + ... + 4548894106.

It is an arithmetic number, because the mean of its divisors is an integer number (1825225832269).

It is a 1-persistent number, because it is pandigital, but 2⋅16407854536921 = 32815709073842 is not.

Almost surely, 2^{16407854536921} is an apocalyptic number.

16407854536921 is the 4050661-st square number.

16407854536921 is the 2025331-st centered octagonal number.

It is an amenable number.

16407854536921 is a deficient number, since it is larger than the sum of its proper divisors (19177953500).

16407854536921 is an frugal number, since it uses more digits than its factorization.

16407854536921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9460 (or 4730 counting only the distinct ones).

The product of its (nonzero) digits is 43545600, while the sum is 61.

The spelling of 16407854536921 in words is "sixteen trillion, four hundred seven billion, eight hundred fifty-four million, five hundred thirty-six thousand, nine hundred twenty-one".