21020020020102 has 8 divisors (see below), whose sum is σ = 42040040040216. Its totient is φ = 7006673340032.

The previous prime is 21020020020101. The next prime is 21020020020107. The reversal of 21020020020102 is 20102002002012.

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

21020020020102 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020020020101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1751668335003 + ... + 1751668335014.

It is an arithmetic number, because the mean of its divisors is an integer number (5255005005027).

Almost surely, 2^{21020020020102} is an apocalyptic number.

21020020020102 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21020020020102 is a wasteful number, since it uses less digits than its factorization.

21020020020102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3503336670022.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21020020020102 its reverse (20102002002012), we get a palindrome (41122022022114).

It can be divided in two parts, 2102002002010 and 2, that added together give a palindrome (2102002002012).

The spelling of 21020020020102 in words is "twenty-one trillion, twenty billion, twenty million, twenty thousand, one hundred two".