1201021010221 has 4 divisors (see below), whose sum is σ = 1201041215452. Its totient is φ = 1201000804992.

The previous prime is 1201021010219. The next prime is 1201021010227. The reversal of 1201021010221 is 1220101201021.

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 964547908996 + 236473101225 = 982114^2 + 486285^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201021010221 - 2¹ = 1201021010219 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 (1201021010227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10013190 + ... + 10132423.

It is an arithmetic number, because the mean of its divisors is an integer number (300260303863).

Almost surely, 2^{1201021010221} is an apocalyptic number.

It is an amenable number.

1201021010221 is a deficient number, since it is larger than the sum of its proper divisors (20205231).

1201021010221 is an equidigital number, since it uses as much as digits as its factorization.

1201021010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20205230.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1201021010221 its reverse (1220101201021), we get a palindrome (2421122211242).

The spelling of 1201021010221 in words is "one trillion, two hundred one billion, twenty-one million, ten thousand, two hundred twenty-one".