21003102 has 12 divisors (see below), whose sum is σ = 45506760. Its totient is φ = 7001028.

The previous prime is 21003097. The next prime is 21003107. The reversal of 21003102 is 20130012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21003097) and next prime (21003107).

It is a super-2 number, since 2×21003102² = 882260587244808, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 583402 + ... + 583437.

It is an arithmetic number, because the mean of its divisors is an integer number (3792230).

Almost surely, 2^21003102 is an apocalyptic number.

21003102 is an abundant number, since it is smaller than the sum of its proper divisors (24503658).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21003102 is a wasteful number, since it uses less digits than its factorization.

21003102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1166847 (or 1166844 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 21003102 is about 4582.9141384058. The cubic root of 21003102 is about 275.9060013864.

Adding to 21003102 its reverse (20130012), we get a palindrome (41133114).

The spelling of 21003102 in words is "twenty-one million, three thousand, one hundred two".