21499085 has 8 divisors (see below), whose sum is σ = 25864440. Its totient is φ = 17155584.

The previous prime is 21499081. The next prime is 21499091. The reversal of 21499085 is 58099412.

It can be written as a sum of positive squares in 4 ways, for example, as 687241 + 20811844 = 829^2 + 4562^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21499085 - 2² = 21499081 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21499081) 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, 3212 + ... + 7301.

It is an arithmetic number, because the mean of its divisors is an integer number (3233055).

Almost surely, 2^21499085 is an apocalyptic number.

It is an amenable number.

21499085 is a deficient number, since it is larger than the sum of its proper divisors (4365355).

21499085 is a wasteful number, since it uses less digits than its factorization.

21499085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10927.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 21499085 is about 4636.7105797106. The cubic root of 21499085 is about 278.0609436287.

It can be divided in two parts, 214 and 99085, that added together give a palindrome (99299).

The spelling of 21499085 in words is "twenty-one million, four hundred ninety-nine thousand, eighty-five".