21435056 has 10 divisors (see below), whose sum is σ = 41530452. Its totient is φ = 10717520.

The previous prime is 21435049. The next prime is 21435061. The reversal of 21435056 is 65053412.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669830 + ... + 669861.

Almost surely, 2^21435056 is an apocalyptic number.

It is an amenable number.

21435056 is a deficient number, since it is larger than the sum of its proper divisors (20095396).

21435056 is a wasteful number, since it uses less digits than its factorization.

21435056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339699 (or 1339693 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 21435056 is about 4629.8008596483. The cubic root of 21435056 is about 277.7846269363.

Adding to 21435056 its reverse (65053412), we get a palindrome (86488468).

The spelling of 21435056 in words is "twenty-one million, four hundred thirty-five thousand, fifty-six".