21113476 has 12 divisors (see below), whose sum is σ = 37171008. Its totient is φ = 10493192.

The previous prime is 21113467. The next prime is 21113527. The reversal of 21113476 is 67431112.

It is a self number, because there is not a number n which added to its sum of digits gives 21113476.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15136 + ... + 16471.

It is an arithmetic number, because the mean of its divisors is an integer number (3097584).

Almost surely, 2^21113476 is an apocalyptic number.

It is an amenable number.

21113476 is a deficient number, since it is larger than the sum of its proper divisors (16057532).

21113476 is a wasteful number, since it uses less digits than its factorization.

21113476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31778 (or 31776 counting only the distinct ones).

The product of its digits is 1008, while the sum is 25.

The square root of 21113476 is about 4594.9402607651. The cubic root of 21113476 is about 276.3884643999.

Adding to 21113476 its reverse (67431112), we get a palindrome (88544588).

The spelling of 21113476 in words is "twenty-one million, one hundred thirteen thousand, four hundred seventy-six".