21227169 has 8 divisors (see below), whose sum is σ = 29967840. Its totient is φ = 13318976.

The previous prime is 21227113. The next prime is 21227177. The reversal of 21227169 is 96172212.

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 21227169 - 2¹¹ = 21225121 is a prime.

It is a super-2 number, since 2×21227169² = 901185407509122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21027169) 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, 208059 + ... + 208160.

It is an arithmetic number, because the mean of its divisors is an integer number (3745980).

Almost surely, 2^21227169 is an apocalyptic number.

It is an amenable number.

21227169 is a deficient number, since it is larger than the sum of its proper divisors (8740671).

21227169 is a wasteful number, since it uses less digits than its factorization.

21227169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416239.

The product of its digits is 3024, while the sum is 30.

The square root of 21227169 is about 4607.2951934948. The cubic root of 21227169 is about 276.8836804770.

The spelling of 21227169 in words is "twenty-one million, two hundred twenty-seven thousand, one hundred sixty-nine".