1221210104401 has 4 divisors (see below), whose sum is σ = 1395668690752. Its totient is φ = 1046751518052.

The previous prime is 1221210104357. The next prime is 1221210104489. The reversal of 1221210104401 is 1044010121221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1221210104401 - 2¹¹ = 1221210102353 is a prime.

It is a super-2 number, since 2×1221210104401² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221210104701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87229293165 + ... + 87229293178.

It is an arithmetic number, because the mean of its divisors is an integer number (348917172688).

Almost surely, 2^{1221210104401} is an apocalyptic number.

It is an amenable number.

1221210104401 is a deficient number, since it is larger than the sum of its proper divisors (174458586351).

1221210104401 is an equidigital number, since it uses as much as digits as its factorization.

1221210104401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174458586350.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1221210104401 its reverse (1044010121221), we get a palindrome (2265220225622).

The spelling of 1221210104401 in words is "one trillion, two hundred twenty-one billion, two hundred ten million, one hundred four thousand, four hundred one".