21414155 has 8 divisors (see below), whose sum is σ = 29368032. Its totient is φ = 14683968.

The previous prime is 21414119. The next prime is 21414193. The reversal of 21414155 is 55141412.

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 21414155 - 2⁶ = 21414091 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21414155.

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, 305882 + ... + 305951.

It is an arithmetic number, because the mean of its divisors is an integer number (3671004).

Almost surely, 2^21414155 is an apocalyptic number.

21414155 is a deficient number, since it is larger than the sum of its proper divisors (7953877).

21414155 is an equidigital number, since it uses as much as digits as its factorization.

21414155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611845.

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

The square root of 21414155 is about 4627.5430846184. The cubic root of 21414155 is about 277.6943097068.

Adding to 21414155 its reverse (55141412), we get a palindrome (76555567).

The spelling of 21414155 in words is "twenty-one million, four hundred fourteen thousand, one hundred fifty-five".