21214797 has 4 divisors (see below), whose sum is σ = 28286400. Its totient is φ = 14143196.

The previous prime is 21214777. The next prime is 21214847. The reversal of 21214797 is 79741212.

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 a cyclic number.

It is not a de Polignac number, because 21214797 - 2⁸ = 21214541 is a prime.

It is a super-2 number, since 2×21214797² = 900135223502418, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3535797 + ... + 3535802.

It is an arithmetic number, because the mean of its divisors is an integer number (7071600).

Almost surely, 2^21214797 is an apocalyptic number.

It is an amenable number.

21214797 is a deficient number, since it is larger than the sum of its proper divisors (7071603).

21214797 is an equidigital number, since it uses as much as digits as its factorization.

21214797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7071602.

The product of its digits is 7056, while the sum is 33.

The square root of 21214797 is about 4605.9523445212. The cubic root of 21214797 is about 276.8298772491.

The spelling of 21214797 in words is "twenty-one million, two hundred fourteen thousand, seven hundred ninety-seven".