16747421 has 4 divisors (see below), whose sum is σ = 17200092. Its totient is φ = 16294752.

The previous prime is 16747403. The next prime is 16747469. The reversal of 16747421 is 12474761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12474761 = 13 ⋅959597.

It can be written as a sum of positive squares in 2 ways, for example, as 15319396 + 1428025 = 3914^2 + 1195^2 .

It is a cyclic number.

It is not a de Polignac number, because 16747421 - 2¹⁰ = 16746397 is a prime.

It is a super-2 number, since 2×16747421² = 560952220302482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16747481) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 226280 + ... + 226353.

It is an arithmetic number, because the mean of its divisors is an integer number (4300023).

Almost surely, 2^16747421 is an apocalyptic number.

It is an amenable number.

16747421 is a deficient number, since it is larger than the sum of its proper divisors (452671).

16747421 is an equidigital number, since it uses as much as digits as its factorization.

16747421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452670.

The product of its digits is 9408, while the sum is 32.

The square root of 16747421 is about 4092.3612988103. The cubic root of 16747421 is about 255.8483649939.

The spelling of 16747421 in words is "sixteen million, seven hundred forty-seven thousand, four hundred twenty-one".