1020202010021 has 4 divisors (see below), whose sum is σ = 1020204463200. Its totient is φ = 1020199556844.

The previous prime is 1020202009999. The next prime is 1020202010057. The reversal of 1020202010021 is 1200102020201.

It is a happy number.

1020202010021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a de Polignac number, because none of the positive numbers 2^k-1020202010021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020202009984 and 1020202010011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020202010071) 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, 430601 + ... + 1491918.

It is an arithmetic number, because the mean of its divisors is an integer number (255051115800).

Almost surely, 2^{1020202010021} is an apocalyptic number.

It is an amenable number.

1020202010021 is a deficient number, since it is larger than the sum of its proper divisors (2453179).

1020202010021 is an equidigital number, since it uses as much as digits as its factorization.

1020202010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2453178.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1020202010021 its reverse (1200102020201), we get a palindrome (2220304030222).

The spelling of 1020202010021 in words is "one trillion, twenty billion, two hundred two million, ten thousand, twenty-one".