20011221230002 has 4 divisors (see below), whose sum is σ = 30016831845006. Its totient is φ = 10005610615000.

The previous prime is 20011221229997. The next prime is 20011221230003. The reversal of 20011221230002 is 20003212211002.

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., 11020932608841 + 8990288621161 = 3319779^2 + 2998381^2 .

It is not an unprimeable number, because it can be changed into a prime (20011221230003) 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 as a sum of consecutive naturals, namely, 5002805307499 + ... + 5002805307502.

Almost surely, 2^{20011221230002} is an apocalyptic number.

20011221230002 is a deficient number, since it is larger than the sum of its proper divisors (10005610615004).

20011221230002 is a wasteful number, since it uses less digits than its factorization.

20011221230002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10005610615003.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20011221230002 its reverse (20003212211002), we get a palindrome (40014433441004).

The spelling of 20011221230002 in words is "twenty trillion, eleven billion, two hundred twenty-one million, two hundred thirty thousand, two".