16652421 has 6 divisors (see below), whose sum is σ = 24053510. Its totient is φ = 11101608.

The previous prime is 16652413. The next prime is 16652443. The reversal of 16652421 is 12425661.

16652421 is a `hidden beast` number, since 1 + 6 + 652 + 4 + 2 + 1 = 666.

16652421 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 16112196 + 540225 = 4014^2 + 735^2 .

It is not a de Polignac number, because 16652421 - 2³ = 16652413 is a prime.

It is a super-2 number, since 2×16652421² = 554606250322482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16652491) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 925126 + ... + 925143.

Almost surely, 2^16652421 is an apocalyptic number.

It is an amenable number.

16652421 is a deficient number, since it is larger than the sum of its proper divisors (7401089).

16652421 is a wasteful number, since it uses less digits than its factorization.

16652421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1850275 (or 1850272 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 16652421 is about 4080.7378009375. The cubic root of 16652421 is about 255.3636794612.

The spelling of 16652421 in words is "sixteen million, six hundred fifty-two thousand, four hundred twenty-one".