2100020121 has 16 divisors (see below), whose sum is σ = 3114936000. Its totient is φ = 1398305664.

The previous prime is 2100020119. The next prime is 2100020141. The reversal of 2100020121 is 1210200012.

It is not a de Polignac number, because 2100020121 - 2¹ = 2100020119 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 (2100020141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24696 + ... + 69353.

It is an arithmetic number, because the mean of its divisors is an integer number (194683500).

Almost surely, 2^2100020121 is an apocalyptic number.

It is an amenable number.

2100020121 is a deficient number, since it is larger than the sum of its proper divisors (1014915879).

2100020121 is an equidigital number, since it uses as much as digits as its factorization.

2100020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94885 (or 94879 counting only the distinct ones).

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

The square root of 2100020121 is about 45825.9764871410. The cubic root of 2100020121 is about 1280.5832549004.

Adding to 2100020121 its reverse (1210200012), we get a palindrome (3310220133).

The spelling of 2100020121 in words is "two billion, one hundred million, twenty thousand, one hundred twenty-one".