21496155 has 16 divisors (see below), whose sum is σ = 35126784. Its totient is φ = 11220320.

The previous prime is 21496151. The next prime is 21496157. The reversal of 21496155 is 55169412.

It is not a de Polignac number, because 21496155 - 2² = 21496151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21496151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14541 + ... + 15950.

It is an arithmetic number, because the mean of its divisors is an integer number (2195424).

Almost surely, 2^21496155 is an apocalyptic number.

21496155 is a deficient number, since it is larger than the sum of its proper divisors (13630629).

21496155 is a wasteful number, since it uses less digits than its factorization.

21496155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30546.

The product of its digits is 10800, while the sum is 33.

The square root of 21496155 is about 4636.3946121960. The cubic root of 21496155 is about 278.0483112216.

It can be divided in two parts, 214 and 96155, that added together give a palindrome (96369).

The spelling of 21496155 in words is "twenty-one million, four hundred ninety-six thousand, one hundred fifty-five".