1020020120221 has 4 divisors (see below), whose sum is σ = 1020309327072. Its totient is φ = 1019730913372.

The previous prime is 1020020120191. The next prime is 1020020120239. The reversal of 1020020120221 is 1220210200201.

It is a happy number.

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 1020020120221 - 2²⁷ = 1019885902493 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 (1020020120261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144598135 + ... + 144605188.

It is an arithmetic number, because the mean of its divisors is an integer number (255077331768).

Almost surely, 2^{1020020120221} is an apocalyptic number.

It is an amenable number.

1020020120221 is a deficient number, since it is larger than the sum of its proper divisors (289206851).

1020020120221 is an equidigital number, since it uses as much as digits as its factorization.

1020020120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289206850.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1020020120221 its reverse (1220210200201), we get a palindrome (2240230320422).

The spelling of 1020020120221 in words is "one trillion, twenty billion, twenty million, one hundred twenty thousand, two hundred twenty-one".