21041032424 has 16 divisors (see below), whose sum is σ = 40518204900. Its totient is φ = 10236177792.

The previous prime is 21041032409. The next prime is 21041032511. The reversal of 21041032424 is 42423014012.

21041032424 = 13713² + 13714² + ... + 13823².

It can be written as a sum of positive squares in 2 ways, for example, as 21019780324 + 21252100 = 144982^2 + 4610^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21041032424.

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, 35541989 + ... + 35542580.

Almost surely, 2^21041032424 is an apocalyptic number.

It is an amenable number.

21041032424 is a deficient number, since it is larger than the sum of its proper divisors (19477172476).

21041032424 is a wasteful number, since it uses less digits than its factorization.

21041032424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71084612 (or 71084608 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21041032424 its reverse (42423014012), we get a palindrome (63464046436).

The spelling of 21041032424 in words is "twenty-one billion, forty-one million, thirty-two thousand, four hundred twenty-four".