21496755 has 32 divisors (see below), whose sum is σ = 41624064. Its totient is φ = 9248256.

The previous prime is 21496753. The next prime is 21496759. The reversal of 21496755 is 55769412.

It is not a de Polignac number, because 21496755 - 2¹ = 21496753 is a prime.

It is a super-2 number, since 2×21496755² = 924220951060050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21496753) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4237 + ... + 7806.

It is an arithmetic number, because the mean of its divisors is an integer number (1300752).

Almost surely, 2^21496755 is an apocalyptic number.

21496755 is a deficient number, since it is larger than the sum of its proper divisors (20127309).

21496755 is a wasteful number, since it uses less digits than its factorization.

21496755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12075.

The product of its digits is 75600, while the sum is 39.

The square root of 21496755 is about 4636.4593171945. The cubic root of 21496755 is about 278.0508981561.

It can be divided in two parts, 214 and 96755, that added together give a palindrome (96969).

The spelling of 21496755 in words is "twenty-one million, four hundred ninety-six thousand, seven hundred fifty-five".