21369416 has 32 divisors (see below), whose sum is σ = 41664000. Its totient is φ = 10264320.

The previous prime is 21369407. The next prime is 21369451. The reversal of 21369416 is 61496312.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49136 + ... + 49568.

It is an arithmetic number, because the mean of its divisors is an integer number (1302000).

Almost surely, 2^21369416 is an apocalyptic number.

It is an amenable number.

21369416 is a deficient number, since it is larger than the sum of its proper divisors (20294584).

21369416 is a wasteful number, since it uses less digits than its factorization.

21369416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669 (or 665 counting only the distinct ones).

The product of its digits is 7776, while the sum is 32.

The square root of 21369416 is about 4622.7065665041. The cubic root of 21369416 is about 277.5007861894.

The spelling of 21369416 in words is "twenty-one million, three hundred sixty-nine thousand, four hundred sixteen".