20121000221002 has 16 divisors (see below), whose sum is σ = 30297475067400. Its totient is φ = 10021883369472.

The previous prime is 20121000220999. The next prime is 20121000221017. The reversal of 20121000221002 is 20012200012102.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11634504861721 + 8486495359281 = 3410939^2 + 2913159^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9405463 + ... + 11344810.

Almost surely, 2^{20121000221002} is an apocalyptic number.

20121000221002 is a deficient number, since it is larger than the sum of its proper divisors (10176474846398).

20121000221002 is a wasteful number, since it uses less digits than its factorization.

20121000221002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20752137.

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

Adding to 20121000221002 its reverse (20012200012102), we get a palindrome (40133200233104).

The spelling of 20121000221002 in words is "twenty trillion, one hundred twenty-one billion, two hundred twenty-one thousand, two".