21226871 has 8 divisors (see below), whose sum is σ = 21773664. Its totient is φ = 20685600.

The previous prime is 21226853. The next prime is 21226879. The reversal of 21226871 is 17862212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21226871 - 2¹⁴ = 21210487 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 (21226879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7046 + ... + 9596.

It is an arithmetic number, because the mean of its divisors is an integer number (2721708).

Almost surely, 2^21226871 is an apocalyptic number.

21226871 is a deficient number, since it is larger than the sum of its proper divisors (546793).

21226871 is a wasteful number, since it uses less digits than its factorization.

21226871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2761.

The product of its digits is 2688, while the sum is 29.

The square root of 21226871 is about 4607.2628533653. The cubic root of 21226871 is about 276.8823847833.

The spelling of 21226871 in words is "twenty-one million, two hundred twenty-six thousand, eight hundred seventy-one".