21276877 has 4 divisors (see below), whose sum is σ = 22528476. Its totient is φ = 20025280.

The previous prime is 21276859. The next prime is 21276907. The reversal of 21276877 is 77867212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10850436 + 10426441 = 3294^2 + 3229^2 .

It is a cyclic number.

It is not a de Polignac number, because 21276877 - 2¹¹ = 21274829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21276377) 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 3 ways as a sum of consecutive naturals, for example, 625774 + ... + 625807.

It is an arithmetic number, because the mean of its divisors is an integer number (5632119).

Almost surely, 2^21276877 is an apocalyptic number.

It is an amenable number.

21276877 is a deficient number, since it is larger than the sum of its proper divisors (1251599).

21276877 is a wasteful number, since it uses less digits than its factorization.

21276877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1251598.

The product of its digits is 65856, while the sum is 40.

The square root of 21276877 is about 4612.6865273938. The cubic root of 21276877 is about 277.0996396356.

The spelling of 21276877 in words is "twenty-one million, two hundred seventy-six thousand, eight hundred seventy-seven".