16229421 has 48 divisors (see below), whose sum is σ = 27221376. Its totient is φ = 9237888.

The previous prime is 16229413. The next prime is 16229443. The reversal of 16229421 is 12492261.

16229421 is a `hidden beast` number, since 16 + 229 + 421 = 666.

It is not a de Polignac number, because 16229421 - 2³ = 16229413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16229471) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 99486 + ... + 99648.

It is an arithmetic number, because the mean of its divisors is an integer number (567112).

Almost surely, 2^16229421 is an apocalyptic number.

It is an amenable number.

16229421 is a deficient number, since it is larger than the sum of its proper divisors (10991955).

16229421 is a wasteful number, since it uses less digits than its factorization.

16229421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242 (or 239 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 16229421 is about 4028.5755547091. The cubic root of 16229421 is about 253.1828836988.

The spelling of 16229421 in words is "sixteen million, two hundred twenty-nine thousand, four hundred twenty-one".