21603416 has 8 divisors (see below), whose sum is σ = 40506420. Its totient is φ = 10801704.

The previous prime is 21603397. The next prime is 21603427. The reversal of 21603416 is 61430612.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 21603391 and 21603400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1350206 + ... + 1350221.

Almost surely, 2^21603416 is an apocalyptic number.

It is an amenable number.

21603416 is a deficient number, since it is larger than the sum of its proper divisors (18903004).

21603416 is a wasteful number, since it uses less digits than its factorization.

21603416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2700433 (or 2700429 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 21603416 is about 4647.9475040065. The cubic root of 21603416 is about 278.5100104165.

The spelling of 21603416 in words is "twenty-one million, six hundred three thousand, four hundred sixteen".