21417316 has 12 divisors (see below), whose sum is σ = 37902060. Its totient is φ = 10588160.

The previous prime is 21417307. The next prime is 21417317. The reversal of 21417316 is 61371412.

It can be written as a sum of positive squares in 2 ways, for example, as 13351716 + 8065600 = 3654^2 + 2840^2 .

It is not an unprimeable number, because it can be changed into a prime (21417317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29725 + ... + 30436.

It is an arithmetic number, because the mean of its divisors is an integer number (3158505).

Almost surely, 2^21417316 is an apocalyptic number.

It is an amenable number.

21417316 is a deficient number, since it is larger than the sum of its proper divisors (16484744).

21417316 is a wasteful number, since it uses less digits than its factorization.

21417316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60254 (or 60252 counting only the distinct ones).

The product of its digits is 1008, while the sum is 25.

The square root of 21417316 is about 4627.8846139462. The cubic root of 21417316 is about 277.7079727648.

Adding to 21417316 its reverse (61371412), we get a palindrome (82788728).

The spelling of 21417316 in words is "twenty-one million, four hundred seventeen thousand, three hundred sixteen".