21416140 has 24 divisors (see below), whose sum is σ = 45071712. Its totient is φ = 8547840.

The previous prime is 21416117. The next prime is 21416167. The reversal of 21416140 is 4161412.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11772 + ... + 13468.

It is an arithmetic number, because the mean of its divisors is an integer number (1877988).

Almost surely, 2^21416140 is an apocalyptic number.

21416140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21416140 is an abundant number, since it is smaller than the sum of its proper divisors (23655572).

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

21416140 is a wasteful number, since it uses less digits than its factorization.

21416140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2337 (or 2335 counting only the distinct ones).

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

The square root of 21416140 is about 4627.7575563117. The cubic root of 21416140 is about 277.7028897974.

Adding to 21416140 its reverse (4161412), we get a palindrome (25577552).

It can be divided in two parts, 2141 and 6140, that added together give a square (8281 = 91²).

The spelling of 21416140 in words is "twenty-one million, four hundred sixteen thousand, one hundred forty".