20010221001002 has 4 divisors (see below), whose sum is σ = 30015331501506. Its totient is φ = 10005110500500.

The previous prime is 20010221000999. The next prime is 20010221001019. The reversal of 20010221001002 is 20010012201002.

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., 19958100567601 + 52120433401 = 4467449^2 + 228299^2 .

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, 5002555250249 + ... + 5002555250252.

Almost surely, 2^{20010221001002} is an apocalyptic number.

20010221001002 is a deficient number, since it is larger than the sum of its proper divisors (10005110500504).

20010221001002 is a wasteful number, since it uses less digits than its factorization.

20010221001002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10005110500503.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20010221001002 its reverse (20010012201002), we get a palindrome (40020233202004).

The spelling of 20010221001002 in words is "twenty trillion, ten billion, two hundred twenty-one million, one thousand, two".