10001001002 has 4 divisors (see below), whose sum is σ = 15001501506. Its totient is φ = 5000500500.

The previous prime is 10001001001. The next prime is 10001001011. The reversal of 10001001002 is 20010010001.

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., 7430612401 + 2570388601 = 86201^2 + 50699^2 .

It is not an unprimeable number, because it can be changed into a prime (10001001001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2500250249 + ... + 2500250252.

Almost surely, 2^10001001002 is an apocalyptic number.

10001001002 is a deficient number, since it is larger than the sum of its proper divisors (5000500504).

10001001002 is an equidigital number, since it uses as much as digits as its factorization.

10001001002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5000500503.

The product of its (nonzero) digits is 2, while the sum is 5.

Adding to 10001001002 its reverse (20010010001), we get a palindrome (30011011003).

The spelling of 10001001002 in words is "ten billion, one million, one thousand, two".