21212200122002 has 4 divisors (see below), whose sum is σ = 31818300183006. Its totient is φ = 10606100061000.

The previous prime is 21212200121927. The next prime is 21212200122013. The reversal of 21212200122002 is 20022100221212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12548590675201 + 8663609446801 = 3542399^2 + 2943401^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5303050030499 + ... + 5303050030502.

Almost surely, 2^{21212200122002} is an apocalyptic number.

21212200122002 is a deficient number, since it is larger than the sum of its proper divisors (10606100061004).

21212200122002 is a wasteful number, since it uses less digits than its factorization.

21212200122002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10606100061003.

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

Adding to 21212200122002 its reverse (20022100221212), we get a palindrome (41234300343214).

The spelling of 21212200122002 in words is "twenty-one trillion, two hundred twelve billion, two hundred million, one hundred twenty-two thousand, two".