1021020010121 has 4 divisors (see below), whose sum is σ = 1021029551892. Its totient is φ = 1021010468352.

The previous prime is 1021020010117. The next prime is 1021020010147. The reversal of 1021020010121 is 1210100201201.

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 809361126025 + 211658884096 = 899645^2 + 460064^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021020010121 - 2² = 1021020010117 is a prime.

It is a super-2 number, since 2×1021020010121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021020010181) 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, 4608536 + ... + 4825001.

It is an arithmetic number, because the mean of its divisors is an integer number (255257387973).

Almost surely, 2^{1021020010121} is an apocalyptic number.

It is an amenable number.

1021020010121 is a deficient number, since it is larger than the sum of its proper divisors (9541771).

1021020010121 is an equidigital number, since it uses as much as digits as its factorization.

1021020010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9541770.

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

Adding to 1021020010121 its reverse (1210100201201), we get a palindrome (2231120211322).

The spelling of 1021020010121 in words is "one trillion, twenty-one billion, twenty million, ten thousand, one hundred twenty-one".