21037416 has 32 divisors (see below), whose sum is σ = 52734240. Its totient is φ = 6993728.

The previous prime is 21037411. The next prime is 21037439. The reversal of 21037416 is 61473012.

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

It is not an unprimeable number, because it can be changed into a prime (21037411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10270 + ... + 12146.

It is an arithmetic number, because the mean of its divisors is an integer number (1647945).

Almost surely, 2^21037416 is an apocalyptic number.

It is an amenable number.

21037416 is an abundant number, since it is smaller than the sum of its proper divisors (31696824).

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

21037416 is a wasteful number, since it uses less digits than its factorization.

21037416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2353 (or 2349 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 21037416 is about 4586.6562984379. The cubic root of 21037416 is about 276.0561742414.

The spelling of 21037416 in words is "twenty-one million, thirty-seven thousand, four hundred sixteen".