16140421 has 8 divisors (see below), whose sum is σ = 17645184. Its totient is φ = 14641920.

The previous prime is 16140419. The next prime is 16140451. The reversal of 16140421 is 12404161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16140421 - 2¹ = 16140419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16140451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5076 + ... + 7618.

It is an arithmetic number, because the mean of its divisors is an integer number (2205648).

Almost surely, 2^16140421 is an apocalyptic number.

16140421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16140421 is a deficient number, since it is larger than the sum of its proper divisors (1504763).

16140421 is a wasteful number, since it uses less digits than its factorization.

16140421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3131.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 16140421 is about 4017.5142812441. The cubic root of 16140421 is about 252.7192279624.

Adding to 16140421 its reverse (12404161), we get a palindrome (28544582).

It can be divided in two parts, 16140 and 421, that added together give a palindrome (16561).

The spelling of 16140421 in words is "sixteen million, one hundred forty thousand, four hundred twenty-one".