21212020010002 has 8 divisors (see below), whose sum is σ = 31818066090300. Its totient is φ = 10605997979904.

The previous prime is 21212020009909. The next prime is 21212020010009. The reversal of 21212020010002 is 20001002021212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19963569099721 + 1248450910281 = 4468061^2 + 1117341^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21212020010009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3616627 + ... + 7450102.

Almost surely, 2^{21212020010002} is an apocalyptic number.

21212020010002 is a deficient number, since it is larger than the sum of its proper divisors (10606046080298).

21212020010002 is a wasteful number, since it uses less digits than its factorization.

21212020010002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12025100.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21212020010002 its reverse (20001002021212), we get a palindrome (41213022031214).

The spelling of 21212020010002 in words is "twenty-one trillion, two hundred twelve billion, twenty million, ten thousand, two".