21276101 has 16 divisors (see below), whose sum is σ = 27095040. Its totient is φ = 16223280.

The previous prime is 21276083. The next prime is 21276109. The reversal of 21276101 is 10167212.

It is a cyclic number.

It is not a de Polignac number, because 21276101 - 2¹⁰ = 21275077 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21276109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 680 + ... + 6558.

It is an arithmetic number, because the mean of its divisors is an integer number (1693440).

Almost surely, 2^21276101 is an apocalyptic number.

It is an amenable number.

21276101 is a deficient number, since it is larger than the sum of its proper divisors (5818939).

21276101 is a wasteful number, since it uses less digits than its factorization.

21276101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5944.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 21276101 is about 4612.6024107872. The cubic root of 21276101 is about 277.0962708465.

Subtracting from 21276101 its reverse (10167212), we obtain a square (11108889 = 3333²).

It can be divided in two parts, 2127 and 6101, that added together give a palindrome (8228).

The spelling of 21276101 in words is "twenty-one million, two hundred seventy-six thousand, one hundred one".