1020202121021 has 4 divisors (see below), whose sum is σ = 1033116072000. Its totient is φ = 1007288170044.

The previous prime is 1020202121017. The next prime is 1020202121023. The reversal of 1020202121021 is 1201212020201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1020202121021 - 2² = 1020202121017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020202120987 and 1020202121005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020202121023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6456975371 + ... + 6456975528.

It is an arithmetic number, because the mean of its divisors is an integer number (258279018000).

Almost surely, 2^{1020202121021} is an apocalyptic number.

It is an amenable number.

1020202121021 is a deficient number, since it is larger than the sum of its proper divisors (12913950979).

1020202121021 is an equidigital number, since it uses as much as digits as its factorization.

1020202121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12913950978.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1020202121021 its reverse (1201212020201), we get a palindrome (2221414141222).

The spelling of 1020202121021 in words is "one trillion, twenty billion, two hundred two million, one hundred twenty-one thousand, twenty-one".