21001102 has 16 divisors (see below), whose sum is σ = 32461632. Its totient is φ = 10183680.

The previous prime is 21001087. The next prime is 21001117. The reversal of 21001102 is 20110012.

It is an interprime number because it is at equal distance from previous prime (21001087) and next prime (21001117).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 15163 + ... + 16489.

It is an arithmetic number, because the mean of its divisors is an integer number (2028852).

Almost surely, 2^21001102 is an apocalyptic number.

21001102 is a deficient number, since it is larger than the sum of its proper divisors (11460530).

21001102 is a wasteful number, since it uses less digits than its factorization.

21001102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1563.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 21001102 is about 4582.6959314360. The cubic root of 21001102 is about 275.8972434814.

Adding to 21001102 its reverse (20110012), we get a palindrome (41111114).

The spelling of 21001102 in words is "twenty-one million, one thousand, one hundred two".