20012221001002 has 4 divisors (see below), whose sum is σ = 30018331501506. Its totient is φ = 10006110500500.

The previous prime is 20012221000997. The next prime is 20012221001009. The reversal of 20012221001002 is 20010012221002.

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., 11754879674521 + 8257341326481 = 3428539^2 + 2873559^2 .

It is not an unprimeable number, because it can be changed into a prime (20012221001009) 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, 5003055250249 + ... + 5003055250252.

Almost surely, 2^{20012221001002} is an apocalyptic number.

20012221001002 is a deficient number, since it is larger than the sum of its proper divisors (10006110500504).

20012221001002 is a wasteful number, since it uses less digits than its factorization.

20012221001002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10006110500503.

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

Adding to 20012221001002 its reverse (20010012221002), we get a palindrome (40022233222004).

The spelling of 20012221001002 in words is "twenty trillion, twelve billion, two hundred twenty-one million, one thousand, two".