16421356 has 48 divisors (see below), whose sum is σ = 35126784. Its totient is φ = 6564096.

The previous prime is 16421347. The next prime is 16421357. The reversal of 16421356 is 65312461.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (16421357) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27396 + ... + 27988.

It is an arithmetic number, because the mean of its divisors is an integer number (731808).

Almost surely, 2^16421356 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16421356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17563392).

16421356 is an abundant number, since it is smaller than the sum of its proper divisors (18705428).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16421356 is a wasteful number, since it uses less digits than its factorization.

16421356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670 (or 668 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The square root of 16421356 is about 4052.3272325912. The cubic root of 16421356 is about 254.1770522437.

The spelling of 16421356 in words is "sixteen million, four hundred twenty-one thousand, three hundred fifty-six".