21111004 has 6 divisors (see below), whose sum is σ = 36944264. Its totient is φ = 10555500.

The previous prime is 21110989. The next prime is 21111007. The reversal of 21111004 is 40011112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2638872 + ... + 2638879.

Almost surely, 2^21111004 is an apocalyptic number.

It is an amenable number.

21111004 is a deficient number, since it is larger than the sum of its proper divisors (15833260).

21111004 is a wasteful number, since it uses less digits than its factorization.

21111004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5277755 (or 5277753 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 21111004 is about 4594.6712613635. The cubic root of 21111004 is about 276.3776773091.

Adding to 21111004 its reverse (40011112), we get a palindrome (61122116).

The spelling of 21111004 in words is "twenty-one million, one hundred eleven thousand, four".