21022002012 has 24 divisors (see below), whose sum is σ = 53510550912. Its totient is φ = 6370303600.

The previous prime is 21022002011. The next prime is 21022002041. The reversal of 21022002012 is 21020022012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022002011) 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, 79628664 + ... + 79628927.

It is an arithmetic number, because the mean of its divisors is an integer number (2229606288).

Almost surely, 2^21022002012 is an apocalyptic number.

21022002012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21022002012 is an abundant number, since it is smaller than the sum of its proper divisors (32488548900).

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

21022002012 is a wasteful number, since it uses less digits than its factorization.

21022002012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159257609 (or 159257607 counting only the distinct ones).

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

Adding to 21022002012 its reverse (21020022012), we get a palindrome (42042024024).

The spelling of 21022002012 in words is "twenty-one billion, twenty-two million, two thousand, twelve".