1012021000121 has 4 divisors (see below), whose sum is σ = 1013207426532. Its totient is φ = 1010834573712.

The previous prime is 1012021000091. The next prime is 1012021000181. The reversal of 1012021000121 is 1210001202101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 81104774521 + 930916225600 = 284789^2 + 964840^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012021000121 - 2¹⁰ = 1012020999097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1012021000181) 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, 593211926 + ... + 593213631.

It is an arithmetic number, because the mean of its divisors is an integer number (253301856633).

Almost surely, 2^{1012021000121} is an apocalyptic number.

It is an amenable number.

1012021000121 is a deficient number, since it is larger than the sum of its proper divisors (1186426411).

1012021000121 is an equidigital number, since it uses as much as digits as its factorization.

1012021000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1186426410.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1012021000121 its reverse (1210001202101), we get a palindrome (2222022202222).

The spelling of 1012021000121 in words is "one trillion, twelve billion, twenty-one million, one hundred twenty-one", and thus it is an aban number.