16162421 has 4 divisors (see below), whose sum is σ = 17631744. Its totient is φ = 14693100.

The previous prime is 16162417. The next prime is 16162423. The reversal of 16162421 is 12426161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16162421 - 2² = 16162417 is a prime.

It is a super-3 number, since 3×16162421³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16162423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 734645 + ... + 734666.

It is an arithmetic number, because the mean of its divisors is an integer number (4407936).

Almost surely, 2^16162421 is an apocalyptic number.

16162421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16162421 is a deficient number, since it is larger than the sum of its proper divisors (1469323).

16162421 is a wasteful number, since it uses less digits than its factorization.

16162421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1469322.

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

The square root of 16162421 is about 4020.2513603007. The cubic root of 16162421 is about 252.8339977660.

Adding to 16162421 its reverse (12426161), we get a palindrome (28588582).

The spelling of 16162421 in words is "sixteen million, one hundred sixty-two thousand, four hundred twenty-one".