1211201100221 has 8 divisors (see below), whose sum is σ = 1416421220544. Its totient is φ = 1014028827840.

The previous prime is 1211201100211. The next prime is 1211201100229. The reversal of 1211201100221 is 1220011021121.

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

It is not a de Polignac number, because 1211201100221 - 2⁶ = 1211201100157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211201100196 and 1211201100205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211201100229) 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, 2011961660 + ... + 2011962261.

It is an arithmetic number, because the mean of its divisors is an integer number (177052652568).

Almost surely, 2^{1211201100221} is an apocalyptic number.

It is an amenable number.

1211201100221 is a deficient number, since it is larger than the sum of its proper divisors (205220120323).

1211201100221 is an equidigital number, since it uses as much as digits as its factorization.

1211201100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4023923971.

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

Adding to 1211201100221 its reverse (1220011021121), we get a palindrome (2431212121342).

The spelling of 1211201100221 in words is "one trillion, two hundred eleven billion, two hundred one million, one hundred thousand, two hundred twenty-one".