1221323210101 has 4 divisors (see below), whose sum is σ = 1221760806304. Its totient is φ = 1220885613900.

The previous prime is 1221323210087. The next prime is 1221323210171. The reversal of 1221323210101 is 1010123231221.

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 1221323210101 - 2¹³ = 1221323201909 is a prime.

It is a super-2 number, since 2×1221323210101² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221323210171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218793915 + ... + 218799496.

It is an arithmetic number, because the mean of its divisors is an integer number (305440201576).

Almost surely, 2^{1221323210101} is an apocalyptic number.

It is an amenable number.

1221323210101 is a deficient number, since it is larger than the sum of its proper divisors (437596203).

1221323210101 is an equidigital number, since it uses as much as digits as its factorization.

1221323210101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437596202.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1221323210101 its reverse (1010123231221), we get a palindrome (2231446441322).

The spelling of 1221323210101 in words is "one trillion, two hundred twenty-one billion, three hundred twenty-three million, two hundred ten thousand, one hundred one".