21030102 has 12 divisors (see below), whose sum is σ = 45565260. Its totient is φ = 7010028.

The previous prime is 21030083. The next prime is 21030109. The reversal of 21030102 is 20103012.

It is a happy number.

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 (21030109) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 584152 + ... + 584187.

It is an arithmetic number, because the mean of its divisors is an integer number (3797105).

Almost surely, 2^21030102 is an apocalyptic number.

21030102 is an abundant number, since it is smaller than the sum of its proper divisors (24535158).

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

21030102 is a wasteful number, since it uses less digits than its factorization.

21030102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1168347 (or 1168344 counting only the distinct ones).

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

The square root of 21030102 is about 4585.8589162773. The cubic root of 21030102 is about 276.0241787261.

Adding to 21030102 its reverse (20103012), we get a palindrome (41133114).

It can be divided in two parts, 2103010 and 2, that added together give a palindrome (2103012).

The spelling of 21030102 in words is "twenty-one million, thirty thousand, one hundred two".