21180102 has 24 divisors (see below), whose sum is σ = 44288664. Its totient is φ = 6752064.

The previous prime is 21180101. The next prime is 21180139. The reversal of 21180102 is 20108112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21180101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 163 + ... + 6510.

It is an arithmetic number, because the mean of its divisors is an integer number (1845361).

Almost surely, 2^21180102 is an apocalyptic number.

21180102 is an abundant number, since it is smaller than the sum of its proper divisors (23108562).

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

21180102 is a wasteful number, since it uses less digits than its factorization.

21180102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6724 (or 6701 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 21180102 is about 4602.1844813088. The cubic root of 21180102 is about 276.6788843172.

Adding to 21180102 its reverse (20108112), we get a palindrome (41288214).

The spelling of 21180102 in words is "twenty-one million, one hundred eighty thousand, one hundred two".