16698121 has 12 divisors (see below), whose sum is σ = 18673200. Its totient is φ = 14916440.

The previous prime is 16698107. The next prime is 16698139. The reversal of 16698121 is 12189661.

It is not a de Polignac number, because 16698121 - 2¹³ = 16689929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16698191) 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, 5970 + ... + 8308.

It is an arithmetic number, because the mean of its divisors is an integer number (1556100).

Almost surely, 2^16698121 is an apocalyptic number.

16698121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16698121 is a deficient number, since it is larger than the sum of its proper divisors (1975079).

16698121 is a wasteful number, since it uses less digits than its factorization.

16698121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2420 (or 2409 counting only the distinct ones).

The product of its digits is 5184, while the sum is 34.

The square root of 16698121 is about 4086.3334420970. Note that the first 3 decimals coincide. The cubic root of 16698121 is about 255.5970681635.

The spelling of 16698121 in words is "sixteen million, six hundred ninety-eight thousand, one hundred twenty-one".