1210210221221 has 8 divisors (see below), whose sum is σ = 1236417436800. Its totient is φ = 1184022091648.

The previous prime is 1210210221217. The next prime is 1210210221287. The reversal of 1210210221221 is 1221220120121.

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 1210210221221 - 2² = 1210210221217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1210210221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210210221211) 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, 4643276 + ... + 4896981.

It is an arithmetic number, because the mean of its divisors is an integer number (154552179600).

Almost surely, 2^{1210210221221} is an apocalyptic number.

It is an amenable number.

1210210221221 is a deficient number, since it is larger than the sum of its proper divisors (26207215579).

1210210221221 is an equidigital number, since it uses as much as digits as its factorization.

1210210221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9543003.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1210210221221 its reverse (1221220120121), we get a palindrome (2431430341342).

The spelling of 1210210221221 in words is "one trillion, two hundred ten billion, two hundred ten million, two hundred twenty-one thousand, two hundred twenty-one".