1220122101221 has 4 divisors (see below), whose sum is σ = 1221269912352. Its totient is φ = 1218974290092.

The previous prime is 1220122101061. The next prime is 1220122101239. The reversal of 1220122101221 is 1221012210221.

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 a de Polignac number, because none of the positive numbers 2^k-1220122101221 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 1220122101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220122121221) 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, 573903971 + ... + 573906096.

It is an arithmetic number, because the mean of its divisors is an integer number (305317478088).

Almost surely, 2^{1220122101221} is an apocalyptic number.

It is an amenable number.

1220122101221 is a deficient number, since it is larger than the sum of its proper divisors (1147811131).

1220122101221 is a wasteful number, since it uses less digits than its factorization.

1220122101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1147811130.

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

Adding to 1220122101221 its reverse (1221012210221), we get a palindrome (2441134311442).

The spelling of 1220122101221 in words is "one trillion, two hundred twenty billion, one hundred twenty-two million, one hundred one thousand, two hundred twenty-one".