1002200121 has 40 divisors (see below), whose sum is σ = 1622445440. Its totient is φ = 612849888.

The previous prime is 1002200117. The next prime is 1002200123. The reversal of 1002200121 is 1210022001.

It is not a de Polignac number, because 1002200121 - 2² = 1002200117 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 (1002200123) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 168720 + ... + 174558.

It is an arithmetic number, because the mean of its divisors is an integer number (40561136).

Almost surely, 2^1002200121 is an apocalyptic number.

It is an amenable number.

1002200121 is a deficient number, since it is larger than the sum of its proper divisors (620245319).

1002200121 is a wasteful number, since it uses less digits than its factorization.

1002200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6027 (or 6018 counting only the distinct ones).

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

The square root of 1002200121 is about 31657.5444562588. The cubic root of 1002200121 is about 1000.7328364862.

Adding to 1002200121 its reverse (1210022001), we get a palindrome (2212222122).

The spelling of 1002200121 in words is "one billion, two million, two hundred thousand, one hundred twenty-one".