21002020102 has 16 divisors (see below), whose sum is σ = 36038341152. Its totient is φ = 8992146240.

The previous prime is 21002020097. The next prime is 21002020103. The reversal of 21002020102 is 20102020012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002020103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 711649 + ... + 740572.

It is an arithmetic number, because the mean of its divisors is an integer number (2252396322).

Almost surely, 2^21002020102 is an apocalyptic number.

21002020102 is a deficient number, since it is larger than the sum of its proper divisors (15036321050).

21002020102 is a wasteful number, since it uses less digits than its factorization.

21002020102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1453263.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21002020102 its reverse (20102020012), we get a palindrome (41104040114).

It can be divided in two parts, 2100 and 2020102, that added together give a palindrome (2022202).

The spelling of 21002020102 in words is "twenty-one billion, two million, twenty thousand, one hundred two".