1201200021221 has 2 divisors, whose sum is σ = 1201200021222. Its totient is φ = 1201200021220.

The previous prime is 1201200021191. The next prime is 1201200021233. The reversal of 1201200021221 is 1221200021021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 770550396100 + 430649625121 = 877810^2 + 656239^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201200021221 - 2⁶ = 1201200021157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1201200021196 and 1201200021205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201200021271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600600010610 + 600600010611.

It is an arithmetic number, because the mean of its divisors is an integer number (600600010611).

Almost surely, 2^{1201200021221} is an apocalyptic number.

It is an amenable number.

1201200021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201200021221 is an equidigital number, since it uses as much as digits as its factorization.

1201200021221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1201200021221 its reverse (1221200021021), we get a palindrome (2422400042242).

The spelling of 1201200021221 in words is "one trillion, two hundred one billion, two hundred million, twenty-one thousand, two hundred twenty-one".