21212002120202 has 8 divisors (see below), whose sum is σ = 31979515887396. Its totient is φ = 10552163491072.

The previous prime is 21212002120193. The next prime is 21212002120207. The reversal of 21212002120202 is 20202120021212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16902055886521 + 4309946233681 = 4111211^2 + 2076041^2 .

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 (21212002120207) 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, 26918784023 + ... + 26918784810.

Almost surely, 2^{21212002120202} is an apocalyptic number.

21212002120202 is a deficient number, since it is larger than the sum of its proper divisors (10767513767194).

21212002120202 is a wasteful number, since it uses less digits than its factorization.

21212002120202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53837569032.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21212002120202 its reverse (20202120021212), we get a palindrome (41414122141414).

The spelling of 21212002120202 in words is "twenty-one trillion, two hundred twelve billion, two million, one hundred twenty thousand, two hundred two".