1002021201 has 12 divisors (see below), whose sum is σ = 1451312512. Its totient is φ = 666191736.

The previous prime is 1002021179. The next prime is 1002021239. The reversal of 1002021201 is 1021202001.

It is not a de Polignac number, because 1002021201 - 2⁵ = 1002021169 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1002021281) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 148381 + ... + 154986.

Almost surely, 2^1002021201 is an apocalyptic number.

It is an amenable number.

1002021201 is a deficient number, since it is larger than the sum of its proper divisors (449291311).

1002021201 is a wasteful number, since it uses less digits than its factorization.

1002021201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303740 (or 303737 counting only the distinct ones).

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

The square root of 1002021201 is about 31654.7184634455. The cubic root of 1002021201 is about 1000.6732802586.

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

The spelling of 1002021201 in words is "one billion, two million, twenty-one thousand, two hundred one".