21414515 has 4 divisors (see below), whose sum is σ = 25697424. Its totient is φ = 17131608.

The previous prime is 21414461. The next prime is 21414529. The reversal of 21414515 is 51541412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21414515 - 2¹² = 21410419 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2141447 + ... + 2141456.

It is an arithmetic number, because the mean of its divisors is an integer number (6424356).

Almost surely, 2^21414515 is an apocalyptic number.

21414515 is a deficient number, since it is larger than the sum of its proper divisors (4282909).

21414515 is an equidigital number, since it uses as much as digits as its factorization.

21414515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4282908.

The product of its digits is 800, while the sum is 23.

The square root of 21414515 is about 4627.5819819858. The cubic root of 21414515 is about 277.6958658331.

Adding to 21414515 its reverse (51541412), we get a palindrome (72955927).

The spelling of 21414515 in words is "twenty-one million, four hundred fourteen thousand, five hundred fifteen".