2002120021 has 8 divisors (see below), whose sum is σ = 2184480288. Its totient is φ = 1819818000.

The previous prime is 2002120013. The next prime is 2002120051. The reversal of 2002120021 is 1200212002.

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

It is not a de Polignac number, because 2002120021 - 2³ = 2002120013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2002120051) 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, 89991 + ... + 110011.

It is an arithmetic number, because the mean of its divisors is an integer number (273060036).

Almost surely, 2^2002120021 is an apocalyptic number.

It is an amenable number.

2002120021 is a deficient number, since it is larger than the sum of its proper divisors (182360267).

2002120021 is a wasteful number, since it uses less digits than its factorization.

2002120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29123.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 2002120021 is about 44745.0558274319. The cubic root of 2002120021 is about 1260.3660692042.

Adding to 2002120021 its reverse (1200212002), we get a palindrome (3202332023).

It can be divided in two parts, 2002 and 120021, that multiplied together give a palindrome (240282042).

The spelling of 2002120021 in words is "two billion, two million, one hundred twenty thousand, twenty-one".