21614155 has 8 divisors (see below), whose sum is σ = 26175600. Its totient is φ = 17132256.

The previous prime is 21614149. The next prime is 21614183. The reversal of 21614155 is 55141612.

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 a de Polignac number, because none of the positive numbers 2^k-21614155 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19285 + ... + 20374.

It is an arithmetic number, because the mean of its divisors is an integer number (3271950).

Almost surely, 2^21614155 is an apocalyptic number.

21614155 is a deficient number, since it is larger than the sum of its proper divisors (4561445).

21614155 is a wasteful number, since it uses less digits than its factorization.

21614155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39773.

The product of its digits is 1200, while the sum is 25.

The square root of 21614155 is about 4649.1026015781. The cubic root of 21614155 is about 278.5561516308.

Adding to 21614155 its reverse (55141612), we get a palindrome (76755767).

The spelling of 21614155 in words is "twenty-one million, six hundred fourteen thousand, one hundred fifty-five".