21494403 has 40 divisors (see below), whose sum is σ = 37078272. Its totient is φ = 12155184.

The previous prime is 21494353. The next prime is 21494411. The reversal of 21494403 is 30449412.

21494403 is a `hidden beast` number, since 214 + 9 + 440 + 3 = 666.

It is not a de Polignac number, because 21494403 - 2¹³ = 21486211 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21494413) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 94576 + ... + 94802.

Almost surely, 2^21494403 is an apocalyptic number.

21494403 is a deficient number, since it is larger than the sum of its proper divisors (15583869).

21494403 is a wasteful number, since it uses less digits than its factorization.

21494403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413 (or 404 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 21494403 is about 4636.2056684319. The cubic root of 21494403 is about 278.0407570974.

The spelling of 21494403 in words is "twenty-one million, four hundred ninety-four thousand, four hundred three".