21212121020002 has 128 divisors (see below), whose sum is σ = 37634870177280. Its totient is φ = 8859751464960.

The previous prime is 21212121019937. The next prime is 21212121020011. The reversal of 21212121020002 is 20002012121212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1342786368 + ... + 1342802164.

It is an arithmetic number, because the mean of its divisors is an integer number (294022423260).

Almost surely, 2^{21212121020002} is an apocalyptic number.

21212121020002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21212121020002 is a deficient number, since it is larger than the sum of its proper divisors (16422749157278).

21212121020002 is a wasteful number, since it uses less digits than its factorization.

21212121020002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16396.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21212121020002 its reverse (20002012121212), we get a palindrome (41214133141214).

It can be divided in two parts, 212121210 and 20002, that added together give a palindrome (212141212).

The spelling of 21212121020002 in words is "twenty-one trillion, two hundred twelve billion, one hundred twenty-one million, twenty thousand, two".