21496655 has 16 divisors (see below), whose sum is σ = 26342400. Its totient is φ = 16837632.

The previous prime is 21496649. The next prime is 21496661. The reversal of 21496655 is 55669412.

It is an interprime number because it is at equal distance from previous prime (21496649) and next prime (21496661).

It is a cyclic number.

It is not a de Polignac number, because 21496655 - 2⁸ = 21496399 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61421 + ... + 61769.

It is an arithmetic number, because the mean of its divisors is an integer number (1646400).

Almost surely, 2^21496655 is an apocalyptic number.

21496655 is a deficient number, since it is larger than the sum of its proper divisors (4845745).

21496655 is a wasteful number, since it uses less digits than its factorization.

21496655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578.

The product of its digits is 64800, while the sum is 38.

The square root of 21496655 is about 4636.4485330908. The cubic root of 21496655 is about 278.0504670037.

It can be divided in two parts, 214 and 96655, that added together give a palindrome (96869).

The spelling of 21496655 in words is "twenty-one million, four hundred ninety-six thousand, six hundred fifty-five".