21011404 has 12 divisors (see below), whose sum is σ = 36855000. Its totient is φ = 10481408.

The previous prime is 21011383. The next prime is 21011411. The reversal of 21011404 is 40411012.

It is a pancake number, because a pancake can be divided into 21011404 parts by 6482 straight cuts.

It is a plaindrome in base 13.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4054 + ... + 7645.

It is an arithmetic number, because the mean of its divisors is an integer number (3071250).

Almost surely, 2^21011404 is an apocalyptic number.

It is an amenable number.

21011404 is a deficient number, since it is larger than the sum of its proper divisors (15843596).

21011404 is a wasteful number, since it uses less digits than its factorization.

21011404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12152 (or 12150 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 21011404 is about 4583.8198044862. The cubic root of 21011404 is about 275.9423495076.

Adding to 21011404 its reverse (40411012), we get a palindrome (61422416).

The spelling of 21011404 in words is "twenty-one million, eleven thousand, four hundred four".