21106164255 has 16 divisors (see below), whose sum is σ = 36839850624. Its totient is φ = 10233291680.

The previous prime is 21106164253. The next prime is 21106164271. The reversal of 21106164255 is 55246160112.

It is not a de Polignac number, because 21106164255 - 2¹ = 21106164253 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21106164251) 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, 63957909 + ... + 63958238.

It is an arithmetic number, because the mean of its divisors is an integer number (2302490664).

Almost surely, 2^21106164255 is an apocalyptic number.

21106164255 is a deficient number, since it is larger than the sum of its proper divisors (15733686369).

21106164255 is a wasteful number, since it uses less digits than its factorization.

21106164255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127916166.

The product of its (nonzero) digits is 14400, while the sum is 33.

The spelling of 21106164255 in words is "twenty-one billion, one hundred six million, one hundred sixty-four thousand, two hundred fifty-five".