21613403 has 8 divisors (see below), whose sum is σ = 24729600. Its totient is φ = 18504360.

The previous prime is 21613379. The next prime is 21613421. The reversal of 21613403 is 30431612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21613403 - 2¹⁰ = 21612379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21613433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9248 + ... + 11346.

It is an arithmetic number, because the mean of its divisors is an integer number (3091200).

Almost surely, 2^21613403 is an apocalyptic number.

21613403 is a deficient number, since it is larger than the sum of its proper divisors (3116197).

21613403 is a wasteful number, since it uses less digits than its factorization.

21613403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3577.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 21613403 is about 4649.0217250514. The cubic root of 21613403 is about 278.5529210835.

The spelling of 21613403 in words is "twenty-one million, six hundred thirteen thousand, four hundred three".