16121771 has 4 divisors (see below), whose sum is σ = 16130544. Its totient is φ = 16113000.

The previous prime is 16121759. The next prime is 16121779. The reversal of 16121771 is 17712161.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 17712161 = 19 ⋅932219.

It is a cyclic number.

It is not a de Polignac number, because 16121771 - 2¹⁴ = 16105387 is a prime.

It is a super-3 number, since 3×16121771³ (a number of 23 digits) contains 333 as substring.

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 16121771.

It is not an unprimeable number, because it can be changed into a prime (16121779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 455 + ... + 5696.

It is an arithmetic number, because the mean of its divisors is an integer number (4032636).

Almost surely, 2^16121771 is an apocalyptic number.

16121771 is a deficient number, since it is larger than the sum of its proper divisors (8773).

16121771 is an equidigital number, since it uses as much as digits as its factorization.

16121771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8772.

The product of its digits is 588, while the sum is 26.

The square root of 16121771 is about 4015.1925234041. The cubic root of 16121771 is about 252.6218527635.

The spelling of 16121771 in words is "sixteen million, one hundred twenty-one thousand, seven hundred seventy-one".