21270416 has 20 divisors (see below), whose sum is σ = 41283072. Its totient is φ = 10616736.

The previous prime is 21270413. The next prime is 21270439. The reversal of 21270416 is 61407212.

It is a junction number, because it is equal to n+sod(n) for n = 21270391 and 21270400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21270413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16781 + ... + 18003.

Almost surely, 2^21270416 is an apocalyptic number.

It is an amenable number.

21270416 is a deficient number, since it is larger than the sum of its proper divisors (20012656).

21270416 is a wasteful number, since it uses less digits than its factorization.

21270416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2318 (or 2312 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 21270416 is about 4611.9861231361. The cubic root of 21270416 is about 277.0715884947.

Adding to 21270416 its reverse (61407212), we get a palindrome (82677628).

The spelling of 21270416 in words is "twenty-one million, two hundred seventy thousand, four hundred sixteen".