1020200002001 has 8 divisors (see below), whose sum is σ = 1022598273480. Its totient is φ = 1017801925632.

The previous prime is 1020200001979. The next prime is 1020200002057. The reversal of 1020200002001 is 1002000020201.

It can be written as a sum of positive squares in 4 ways, for example, as 16757043601 + 1003442958400 = 129449^2 + 1001720^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020200002001 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1020200002001.

It is not an unprimeable number, because it can be changed into a prime (1020200004001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20381861 + ... + 20431853.

It is an arithmetic number, because the mean of its divisors is an integer number (127824784185).

Almost surely, 2^{1020200002001} is an apocalyptic number.

It is an amenable number.

1020200002001 is a deficient number, since it is larger than the sum of its proper divisors (2398271479).

1020200002001 is an equidigital number, since it uses as much as digits as its factorization.

1020200002001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97555.

The product of its (nonzero) digits is 8, while the sum is 8.

Adding to 1020200002001 its reverse (1002000020201), we get a palindrome (2022200022202).

The spelling of 1020200002001 in words is "one trillion, twenty billion, two hundred million, two thousand, one".