21276601 has 4 divisors (see below), whose sum is σ = 21292432. Its totient is φ = 21260772.

The previous prime is 21276583. The next prime is 21276611. The reversal of 21276601 is 10667212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21276601 - 2⁵ = 21276569 is a prime.

It is a super-2 number, since 2×21276601² = 905387500226402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21276611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5691 + ... + 8656.

It is an arithmetic number, because the mean of its divisors is an integer number (5323108).

Almost surely, 2^21276601 is an apocalyptic number.

It is an amenable number.

21276601 is a deficient number, since it is larger than the sum of its proper divisors (15831).

21276601 is a wasteful number, since it uses less digits than its factorization.

21276601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15830.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 21276601 is about 4612.6566098074. The cubic root of 21276601 is about 277.0984414674.

The spelling of 21276601 in words is "twenty-one million, two hundred seventy-six thousand, six hundred one".