2002100121 has 12 divisors (see below), whose sum is σ = 3305054272. Its totient is φ = 1144057176.

The previous prime is 2002100099. The next prime is 2002100201. The reversal of 2002100121 is 1210012002.

It is not a de Polignac number, because 2002100121 - 2¹³ = 2002091929 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 (2002104121) 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, 15889621 + ... + 15889746.

Almost surely, 2^2002100121 is an apocalyptic number.

2002100121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2002100121 is a deficient number, since it is larger than the sum of its proper divisors (1302954151).

2002100121 is a wasteful number, since it uses less digits than its factorization.

2002100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31779380 (or 31779377 counting only the distinct ones).

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

The square root of 2002100121 is about 44744.8334559422. The cubic root of 2002100121 is about 1260.3618934026.

Adding to 2002100121 its reverse (1210012002), we get a palindrome (3212112123).

The spelling of 2002100121 in words is "two billion, two million, one hundred thousand, one hundred twenty-one".