21417086 has 16 divisors (see below), whose sum is σ = 32779536. Its totient is φ = 10492416.

The previous prime is 21417031. The next prime is 21417089. The reversal of 21417086 is 68071412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21417089) 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, 36830 + ... + 37406.

It is an arithmetic number, because the mean of its divisors is an integer number (2048721).

Almost surely, 2^21417086 is an apocalyptic number.

21417086 is a deficient number, since it is larger than the sum of its proper divisors (11362450).

21417086 is a wasteful number, since it uses less digits than its factorization.

21417086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 21417086 is about 4627.8597645132. The cubic root of 21417086 is about 277.7069786617.

Adding to 21417086 its reverse (68071412), we get a palindrome (89488498).

The spelling of 21417086 in words is "twenty-one million, four hundred seventeen thousand, eighty-six".