1021202001 has 24 divisors (see below), whose sum is σ = 1543875840. Its totient is φ = 649224576.

The previous prime is 1021201999. The next prime is 1021202069. The reversal of 1021202001 is 1002021201.

It is not a de Polignac number, because 1021202001 - 2¹ = 1021201999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (1021202071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62440 + ... + 77078.

It is an arithmetic number, because the mean of its divisors is an integer number (64328160).

Almost surely, 2^1021202001 is an apocalyptic number.

It is an amenable number.

1021202001 is a deficient number, since it is larger than the sum of its proper divisors (522673839).

1021202001 is a wasteful number, since it uses less digits than its factorization.

1021202001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15005 (or 15002 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1021202001 is about 31956.2513602581. The cubic root of 1021202001 is about 1007.0179665956.

Adding to 1021202001 its reverse (1002021201), we get a palindrome (2023223202).

The spelling of 1021202001 in words is "one billion, twenty-one million, two hundred two thousand, one".