1020012101 has 4 divisors (see below), whose sum is σ = 1021083372. Its totient is φ = 1018940832.

The previous prime is 1020012013. The next prime is 1020012107. The reversal of 1020012101 is 1012100201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1012100201 = 7 ⋅144585743.

It can be written as a sum of positive squares in 2 ways, for example, as 362140900 + 657871201 = 19030^2 + 25649^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020012101 - 2¹⁰ = 1020011077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020012107) 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, 534206 + ... + 536111.

It is an arithmetic number, because the mean of its divisors is an integer number (255270843).

Almost surely, 2^1020012101 is an apocalyptic number.

It is an amenable number.

1020012101 is a deficient number, since it is larger than the sum of its proper divisors (1071271).

1020012101 is an equidigital number, since it uses as much as digits as its factorization.

1020012101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1071270.

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

The square root of 1020012101 is about 31937.6282932844. The cubic root of 1020012101 is about 1006.6266903095.

Adding to 1020012101 its reverse (1012100201), we get a palindrome (2032112302).

The spelling of 1020012101 in words is "one billion, twenty million, twelve thousand, one hundred one".