1201110021221 has 12 divisors (see below), whose sum is σ = 1320911622156. Its totient is φ = 1091353105920.

The previous prime is 1201110021191. The next prime is 1201110021277. The reversal of 1201110021221 is 1221200111021.

It can be written as a sum of positive squares in 2 ways, for example, as 735220502500 + 465889518721 = 857450^2 + 682561^2 .

It is not a de Polignac number, because 1201110021221 - 2³⁸ = 926232114277 is a prime.

It is a super-2 number, since 2×1201110021221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1201110021196 and 1201110021205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201110021821) 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 11 ways as a sum of consecutive naturals, for example, 2333756 + ... + 2801541.

It is an arithmetic number, because the mean of its divisors is an integer number (110075968513).

Almost surely, 2^{1201110021221} is an apocalyptic number.

1201110021221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1201110021221 is a deficient number, since it is larger than the sum of its proper divisors (119801600935).

1201110021221 is a wasteful number, since it uses less digits than its factorization.

1201110021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5137252 (or 5137241 counting only the distinct ones).

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

Adding to 1201110021221 its reverse (1221200111021), we get a palindrome (2422310132242).

The spelling of 1201110021221 in words is "one trillion, two hundred one billion, one hundred ten million, twenty-one thousand, two hundred twenty-one".