16612421 has 12 divisors (see below), whose sum is σ = 19798380. Its totient is φ = 13890240.

The previous prime is 16612399. The next prime is 16612423. The reversal of 16612421 is 12421661.

It can be written as a sum of positive squares in 2 ways, for example, as 7761796 + 8850625 = 2786^2 + 2975^2 .

It is not a de Polignac number, because 16612421 - 2²² = 12418117 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16612423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2126 + ... + 6143.

It is an arithmetic number, because the mean of its divisors is an integer number (1649865).

Almost surely, 2^16612421 is an apocalyptic number.

It is an amenable number.

16612421 is a deficient number, since it is larger than the sum of its proper divisors (3185959).

16612421 is an equidigital number, since it uses as much as digits as its factorization.

16612421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8324 (or 8317 counting only the distinct ones).

The product of its digits is 576, while the sum is 23.

The square root of 16612421 is about 4075.8337797315. The cubic root of 16612421 is about 255.1590498213.

The spelling of 16612421 in words is "sixteen million, six hundred twelve thousand, four hundred twenty-one".