2100520121 has 8 divisors (see below), whose sum is σ = 2405527680. Its totient is φ = 1796745888.

The previous prime is 2100520111. The next prime is 2100520127. The reversal of 2100520121 is 1210250012.

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

It is not a de Polignac number, because 2100520121 - 2¹⁴ = 2100503737 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2100520096 and 2100520105.

It is not an unprimeable number, because it can be changed into a prime (2100520127) 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, 304676 + ... + 311493.

It is an arithmetic number, because the mean of its divisors is an integer number (300690960).

Almost surely, 2^2100520121 is an apocalyptic number.

It is an amenable number.

2100520121 is a deficient number, since it is larger than the sum of its proper divisors (305007559).

2100520121 is an equidigital number, since it uses as much as digits as its factorization.

2100520121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616663.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 2100520121 is about 45831.4315835759. The cubic root of 2100520121 is about 1280.6848794533.

Adding to 2100520121 its reverse (1210250012), we get a palindrome (3310770133).

The spelling of 2100520121 in words is "two billion, one hundred million, five hundred twenty thousand, one hundred twenty-one".