21214646 has 8 divisors (see below), whose sum is σ = 32137344. Its totient is φ = 10502200.

The previous prime is 21214643. The next prime is 21214649. The reversal of 21214646 is 64641212.

It is an interprime number because it is at equal distance from previous prime (21214643) and next prime (21214649).

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

It is a super-2 number, since 2×21214646² = 900122409810632, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214643) 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, 52310 + ... + 52713.

It is an arithmetic number, because the mean of its divisors is an integer number (4017168).

Almost surely, 2^21214646 is an apocalyptic number.

21214646 is a deficient number, since it is larger than the sum of its proper divisors (10922698).

21214646 is a wasteful number, since it uses less digits than its factorization.

21214646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105126.

The product of its digits is 2304, while the sum is 26.

The square root of 21214646 is about 4605.9359526594. The cubic root of 21214646 is about 276.8292204526.

Adding to 21214646 its reverse (64641212), we get a palindrome (85855858).

The spelling of 21214646 in words is "twenty-one million, two hundred fourteen thousand, six hundred forty-six".