2002121001 has 24 divisors (see below), whose sum is σ = 2946265920. Its totient is φ = 1309831776.

The previous prime is 2002120969. The next prime is 2002121003. The reversal of 2002121001 is 1001212002.

It is not a de Polignac number, because 2002121001 - 2⁵ = 2002120969 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 (2002121003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 156036 + ... + 168378.

It is an arithmetic number, because the mean of its divisors is an integer number (122761080).

Almost surely, 2^2002121001 is an apocalyptic number.

It is an amenable number.

2002121001 is a deficient number, since it is larger than the sum of its proper divisors (944144919).

2002121001 is a wasteful number, since it uses less digits than its factorization.

2002121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12685 (or 12682 counting only the distinct ones).

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

The square root of 2002121001 is about 44745.0667783612. The cubic root of 2002121001 is about 1260.3662748460.

Adding to 2002121001 its reverse (1001212002), we get a palindrome (3003333003).

The spelling of 2002121001 in words is "two billion, two million, one hundred twenty-one thousand, one".