21020102 has 8 divisors (see below), whose sum is σ = 31731456. Its totient is φ = 10442952.

The previous prime is 21020093. The next prime is 21020117. The reversal of 21020102 is 20102012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21020102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33158 + ... + 33785.

It is an arithmetic number, because the mean of its divisors is an integer number (3966432).

Almost surely, 2^21020102 is an apocalyptic number.

21020102 is a deficient number, since it is larger than the sum of its proper divisors (10711354).

21020102 is a wasteful number, since it uses less digits than its factorization.

21020102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67102.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 21020102 is about 4584.7684783422. The cubic root of 21020102 is about 275.9804211414.

Adding to 21020102 its reverse (20102012), we get a palindrome (41122114).

It can be divided in two parts, 2102010 and 2, that added together give a palindrome (2102012).

The spelling of 21020102 in words is "twenty-one million, twenty thousand, one hundred two".