21100011 has 16 divisors (see below), whose sum is σ = 28788480. Its totient is φ = 13743200.

The previous prime is 21100007. The next prime is 21100019. The reversal of 21100011 is 11000112.

It is a cyclic number.

It is not a de Polignac number, because 21100011 - 2² = 21100007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21100019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24730 + ... + 25568.

It is an arithmetic number, because the mean of its divisors is an integer number (1799280).

Almost surely, 2^21100011 is an apocalyptic number.

21100011 is a deficient number, since it is larger than the sum of its proper divisors (7688469).

21100011 is a wasteful number, since it uses less digits than its factorization.

21100011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1026.

The product of its (nonzero) digits is 2, while the sum is 6.

The square root of 21100011 is about 4593.4748284931. The cubic root of 21100011 is about 276.3296968448.

Adding to 21100011 its reverse (11000112), we get a palindrome (32100123).

Multiplying 21100011 by its reverse (11000112), we get a palindrome (232102484201232).

It can be divided in two parts, 2 and 1100011, that multiplied together give a palindrome (2200022).

The spelling of 21100011 in words is "twenty-one million, one hundred thousand, eleven".