21616374 has 32 divisors (see below), whose sum is σ = 46738944. Its totient is φ = 6625440.

The previous prime is 21616373. The next prime is 21616417. The reversal of 21616374 is 47361612.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21616373) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33297 + ... + 33939.

It is an arithmetic number, because the mean of its divisors is an integer number (1460592).

Almost surely, 2^21616374 is an apocalyptic number.

21616374 is an abundant number, since it is smaller than the sum of its proper divisors (25122570).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21616374 is a wasteful number, since it uses less digits than its factorization.

21616374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1092.

The product of its digits is 6048, while the sum is 30.

The square root of 21616374 is about 4649.3412436602. The cubic root of 21616374 is about 278.5656838864.

Adding to 21616374 its reverse (47361612), we get a palindrome (68977986).

The spelling of 21616374 in words is "twenty-one million, six hundred sixteen thousand, three hundred seventy-four".