21214461 has 8 divisors (see below), whose sum is σ = 28509184. Its totient is φ = 14031360.

The previous prime is 21214451. The next prime is 21214463. The reversal of 21214461 is 16441212.

It is a happy number.

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

It is not a de Polignac number, because 21214461 - 2⁵ = 21214429 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 (21214463) 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, 27460 + ... + 28221.

It is an arithmetic number, because the mean of its divisors is an integer number (3563648).

Almost surely, 2^21214461 is an apocalyptic number.

It is an amenable number.

21214461 is a deficient number, since it is larger than the sum of its proper divisors (7294723).

21214461 is a wasteful number, since it uses less digits than its factorization.

21214461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55811.

The product of its digits is 384, while the sum is 21.

The square root of 21214461 is about 4605.9158698352. The cubic root of 21214461 is about 276.8284157639.

Adding to 21214461 its reverse (16441212), we get a palindrome (37655673).

The spelling of 21214461 in words is "twenty-one million, two hundred fourteen thousand, four hundred sixty-one".