21403485 has 48 divisors (see below), whose sum is σ = 39037440. Its totient is φ = 10834560.

The previous prime is 21403483. The next prime is 21403559. The reversal of 21403485 is 58430412.

It is not a de Polignac number, because 21403485 - 2¹ = 21403483 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21403483) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 93351 + ... + 93579.

It is an arithmetic number, because the mean of its divisors is an integer number (813280).

Almost surely, 2^21403485 is an apocalyptic number.

It is an amenable number.

21403485 is a deficient number, since it is larger than the sum of its proper divisors (17633955).

21403485 is a wasteful number, since it uses less digits than its factorization.

21403485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338 (or 335 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 21403485 is about 4626.3900613761. The cubic root of 21403485 is about 277.6481799304.

Adding to 21403485 its reverse (58430412), we get a palindrome (79833897).

It can be divided in two parts, 2140 and 3485, that added together give a square (5625 = 75²).

The spelling of 21403485 in words is "twenty-one million, four hundred three thousand, four hundred eighty-five".