1011201021221 has 4 divisors (see below), whose sum is σ = 1070683434252. Its totient is φ = 951718608192.

The previous prime is 1011201021209. The next prime is 1011201021241. The reversal of 1011201021221 is 1221201021101.

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 426427284196 + 584773737025 = 653014^2 + 764705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1011201021221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011201021196 and 1011201021205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011201021241) 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, 29741206490 + ... + 29741206523.

It is an arithmetic number, because the mean of its divisors is an integer number (267670858563).

Almost surely, 2^{1011201021221} is an apocalyptic number.

It is an amenable number.

1011201021221 is a deficient number, since it is larger than the sum of its proper divisors (59482413031).

1011201021221 is an equidigital number, since it uses as much as digits as its factorization.

1011201021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59482413030.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1011201021221 its reverse (1221201021101), we get a palindrome (2232402042322).

The spelling of 1011201021221 in words is "one trillion, eleven billion, two hundred one million, twenty-one thousand, two hundred twenty-one".