2100121015 has 16 divisors (see below), whose sum is σ = 2656091520. Its totient is φ = 1589686560.

The previous prime is 2100121003. The next prime is 2100121021. The reversal of 2100121015 is 5101210012.

It is not a de Polignac number, because 2100121015 - 2⁷ = 2100120887 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2100120986 and 2100121004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65200 + ... + 91930.

It is an arithmetic number, because the mean of its divisors is an integer number (166005720).

Almost surely, 2^2100121015 is an apocalyptic number.

2100121015 is a deficient number, since it is larger than the sum of its proper divisors (555970505).

2100121015 is a wasteful number, since it uses less digits than its factorization.

2100121015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27582.

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 2100121015 is about 45827.0773124361. The cubic root of 2100121015 is about 1280.6037628146.

Adding to 2100121015 its reverse (5101210012), we get a palindrome (7201331027).

The spelling of 2100121015 in words is "two billion, one hundred million, one hundred twenty-one thousand, fifteen".