21022102002 has 64 divisors (see below), whose sum is σ = 47726475264. Its totient is φ = 6117109440.

The previous prime is 21022101983. The next prime is 21022102009. The reversal of 21022102002 is 20020122012.

It is not an unprimeable number, because it can be changed into a prime (21022102009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 100473 + ... + 228339.

It is an arithmetic number, because the mean of its divisors is an integer number (745726176).

Almost surely, 2^21022102002 is an apocalyptic number.

21022102002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21022102002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23863237632).

21022102002 is an abundant number, since it is smaller than the sum of its proper divisors (26704373262).

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

21022102002 is a wasteful number, since it uses less digits than its factorization.

21022102002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127983.

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

Adding to 21022102002 its reverse (20020122012), we get a palindrome (41042224014).

The spelling of 21022102002 in words is "twenty-one billion, twenty-two million, one hundred two thousand, two".