21202020012 has 24 divisors (see below), whose sum is σ = 49474882800. Its totient is φ = 7066839616.

The previous prime is 21202019983. The next prime is 21202020013. The reversal of 21202020012 is 21002020212.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21202020012.

It is not an unprimeable number, because it can be changed into a prime (21202020013) 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, 140314 + ... + 249182.

It is an arithmetic number, because the mean of its divisors is an integer number (2061453450).

Almost surely, 2^21202020012 is an apocalyptic number.

It is an amenable number.

21202020012 is an abundant number, since it is smaller than the sum of its proper divisors (28272862788).

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

21202020012 is a wasteful number, since it uses less digits than its factorization.

21202020012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125105 (or 125103 counting only the distinct ones).

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

Adding to 21202020012 its reverse (21002020212), we get a palindrome (42204040224).

It can be divided in two parts, 212020200 and 12, that added together give a palindrome (212020212).

The spelling of 21202020012 in words is "twenty-one billion, two hundred two million, twenty thousand, twelve".