21227297 has 8 divisors (see below), whose sum is σ = 26126016. Its totient is φ = 16795152.

The previous prime is 21227291. The next prime is 21227303. The reversal of 21227297 is 79272212.

It is an interprime number because it is at equal distance from previous prime (21227291) and next prime (21227303).

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 21227297 - 2¹⁶ = 21161761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21227291) 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, 116543 + ... + 116724.

It is an arithmetic number, because the mean of its divisors is an integer number (3265752).

Almost surely, 2^21227297 is an apocalyptic number.

It is an amenable number.

21227297 is a deficient number, since it is larger than the sum of its proper divisors (4898719).

21227297 is a wasteful number, since it uses less digits than its factorization.

21227297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233287.

The product of its digits is 7056, while the sum is 32.

The square root of 21227297 is about 4607.3090844874. The cubic root of 21227297 is about 276.8842370128.

The spelling of 21227297 in words is "twenty-one million, two hundred twenty-seven thousand, two hundred ninety-seven".