21416180 has 24 divisors (see below), whose sum is σ = 45096072. Its totient is φ = 8543232.

The previous prime is 21416177. The next prime is 21416183. The reversal of 21416180 is 8161412.

It is an interprime number because it is at equal distance from previous prime (21416177) and next prime (21416183).

It can be written as a sum of positive squares in 4 ways, for example, as 1094116 + 20322064 = 1046^2 + 4508^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21416183) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7424 + ... + 9896.

It is an arithmetic number, because the mean of its divisors is an integer number (1879003).

Almost surely, 2^21416180 is an apocalyptic number.

21416180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21416180 is an abundant number, since it is smaller than the sum of its proper divisors (23679892).

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

21416180 is a wasteful number, since it uses less digits than its factorization.

21416180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2915 (or 2913 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 21416180 is about 4627.7618780573. The cubic root of 21416180 is about 277.7030626905.

Adding to 21416180 its reverse (8161412), we get a palindrome (29577592).

The spelling of 21416180 in words is "twenty-one million, four hundred sixteen thousand, one hundred eighty".