21341616 has 40 divisors (see below), whose sum is σ = 56179440. Its totient is φ = 6978816.

The previous prime is 21341611. The next prime is 21341627. The reversal of 21341616 is 61614312.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (21341611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1651 + ... + 6738.

It is an arithmetic number, because the mean of its divisors is an integer number (1404486).

Almost surely, 2^21341616 is an apocalyptic number.

It is an amenable number.

21341616 is an abundant number, since it is smaller than the sum of its proper divisors (34837824).

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

21341616 is a wasteful number, since it uses less digits than its factorization.

21341616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8453 (or 8447 counting only the distinct ones).

The product of its digits is 864, while the sum is 24.

The square root of 21341616 is about 4619.6986914733. The cubic root of 21341616 is about 277.3803980981.

Adding to 21341616 its reverse (61614312), we get a palindrome (82955928).

The spelling of 21341616 in words is "twenty-one million, three hundred forty-one thousand, six hundred sixteen".