21276893 has 4 divisors (see below), whose sum is σ = 23211168. Its totient is φ = 19342620.

The previous prime is 21276859. The next prime is 21276907. The reversal of 21276893 is 39867212.

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 not a de Polignac number, because 21276893 - 2¹⁰ = 21275869 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 (21276803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 967121 + ... + 967142.

It is an arithmetic number, because the mean of its divisors is an integer number (5802792).

Almost surely, 2^21276893 is an apocalyptic number.

It is an amenable number.

21276893 is a deficient number, since it is larger than the sum of its proper divisors (1934275).

21276893 is a wasteful number, since it uses less digits than its factorization.

21276893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1934274.

The product of its digits is 36288, while the sum is 38.

The square root of 21276893 is about 4612.6882617407. The cubic root of 21276893 is about 277.0997090943.

The spelling of 21276893 in words is "twenty-one million, two hundred seventy-six thousand, eight hundred ninety-three".