1020100121 has 4 divisors (see below), whose sum is σ = 1026597732. Its totient is φ = 1013602512.

The previous prime is 1020100099. The next prime is 1020100171. The reversal of 1020100121 is 1210010201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1210010201 = 3929 ⋅307969.

It can be written as a sum of positive squares in 2 ways, for example, as 298425625 + 721674496 = 17275^2 + 26864^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020100121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020100099 and 1020100108.

It is not an unprimeable number, because it can be changed into a prime (1020100171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3248570 + ... + 3248883.

It is an arithmetic number, because the mean of its divisors is an integer number (256649433).

Almost surely, 2^1020100121 is an apocalyptic number.

It is an amenable number.

1020100121 is a deficient number, since it is larger than the sum of its proper divisors (6497611).

1020100121 is an equidigital number, since it uses as much as digits as its factorization.

1020100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6497610.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1020100121 is about 31939.0062619362. The cubic root of 1020100121 is about 1006.6556444539.

Adding to 1020100121 its reverse (1210010201), we get a palindrome (2230110322).

It can be divided in two parts, 1020100 and 121, that multiplied together give a square (123432100 = 11110²).

The spelling of 1020100121 in words is "one billion, twenty million, one hundred thousand, one hundred twenty-one".