21415055 has 8 divisors (see below), whose sum is σ = 25758000. Its totient is φ = 17092096.

The previous prime is 21415027. The next prime is 21415067. The reversal of 21415055 is 55051412.

It is a happy number.

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 21415055 - 2¹² = 21410959 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21415055.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2525 + ... + 7014.

It is an arithmetic number, because the mean of its divisors is an integer number (3219750).

Almost surely, 2^21415055 is an apocalyptic number.

21415055 is a deficient number, since it is larger than the sum of its proper divisors (4342945).

21415055 is an equidigital number, since it uses as much as digits as its factorization.

21415055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9993.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 21415055 is about 4627.6403274239. The cubic root of 21415055 is about 277.6981999899.

Adding to 21415055 its reverse (55051412), we get a palindrome (76466467).

The spelling of 21415055 in words is "twenty-one million, four hundred fifteen thousand, fifty-five".