16242121 has 8 divisors (see below), whose sum is σ = 18681920. Its totient is φ = 13832208.

The previous prime is 16242103. The next prime is 16242133. The reversal of 16242121 is 12124261.

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 16242121 - 2⁹ = 16241609 is a prime.

It is a Duffinian number.

16242121 is a modest number, since divided by 2121 gives 1624 as remainder.

It is not an unprimeable number, because it can be changed into a prime (16242101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6291 + ... + 8488.

It is an arithmetic number, because the mean of its divisors is an integer number (2335240).

Almost surely, 2^16242121 is an apocalyptic number.

It is an amenable number.

16242121 is a deficient number, since it is larger than the sum of its proper divisors (2439799).

16242121 is a wasteful number, since it uses less digits than its factorization.

16242121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14943.

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

The square root of 16242121 is about 4030.1514859866. The cubic root of 16242121 is about 253.2489075014.

Adding to 16242121 its reverse (12124261), we get a palindrome (28366382).

It can be divided in two parts, 16 and 242121, that multiplied together give a triangular number (3873936 = T₂₇₈₃).

The spelling of 16242121 in words is "sixteen million, two hundred forty-two thousand, one hundred twenty-one".