1211202110221 has 8 divisors (see below), whose sum is σ = 1240923789504. Its totient is φ = 1181832167040.

The previous prime is 1211202110213. The next prime is 1211202110233. The reversal of 1211202110221 is 1220112021121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211202110221 - 2³ = 1211202110213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211202110195 and 1211202110204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211202110281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87927055 + ... + 87940828.

It is an arithmetic number, because the mean of its divisors is an integer number (155115473688).

Almost surely, 2^{1211202110221} is an apocalyptic number.

It is an amenable number.

1211202110221 is a deficient number, since it is larger than the sum of its proper divisors (29721679283).

1211202110221 is an equidigital number, since it uses as much as digits as its factorization.

1211202110221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175868051.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1211202110221 its reverse (1220112021121), we get a palindrome (2431314131342).

The spelling of 1211202110221 in words is "one trillion, two hundred eleven billion, two hundred two million, one hundred ten thousand, two hundred twenty-one".