21216062 has 16 divisors (see below), whose sum is σ = 36506592. Its totient is φ = 9058560.

The previous prime is 21216061. The next prime is 21216073. The reversal of 21216062 is 26061212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21216061) 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, 1238 + ... + 6630.

It is an arithmetic number, because the mean of its divisors is an integer number (2281662).

Almost surely, 2^21216062 is an apocalyptic number.

21216062 is a deficient number, since it is larger than the sum of its proper divisors (15290530).

21216062 is a wasteful number, since it uses less digits than its factorization.

21216062 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5683.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 21216062 is about 4606.0896647807. The cubic root of 21216062 is about 276.8353794281.

Adding to 21216062 its reverse (26061212), we get a palindrome (47277274).

The spelling of 21216062 in words is "twenty-one million, two hundred sixteen thousand, sixty-two".