1221022212101 has 8 divisors (see below), whose sum is σ = 1233931212864. Its totient is φ = 1208140944480.

The previous prime is 1221022212073. The next prime is 1221022212131. The reversal of 1221022212101 is 1012122201221.

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 1221022212101 - 2¹⁰ = 1221022211077 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 1221022212101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221022212131) 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, 6844760 + ... + 7020881.

It is an arithmetic number, because the mean of its divisors is an integer number (154241401608).

Almost surely, 2^{1221022212101} is an apocalyptic number.

It is an amenable number.

1221022212101 is a deficient number, since it is larger than the sum of its proper divisors (12909000763).

1221022212101 is a wasteful number, since it uses less digits than its factorization.

1221022212101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13866571.

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

Adding to 1221022212101 its reverse (1012122201221), we get a palindrome (2233144413322).

The spelling of 1221022212101 in words is "one trillion, two hundred twenty-one billion, twenty-two million, two hundred twelve thousand, one hundred one".