1220103121221 has 48 divisors (see below), whose sum is σ = 1859659838400. Its totient is φ = 769982505984.

The previous prime is 1220103121217. The next prime is 1220103121241. The reversal of 1220103121221 is 1221213010221.

1220103121221 is a `hidden beast` number, since 1 + 220 + 10 + 312 + 122 + 1 = 666.

It is not a de Polignac number, because 1220103121221 - 2² = 1220103121217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220103121194 and 1220103121203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220103121201) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1585650 + ... + 2225868.

It is an arithmetic number, because the mean of its divisors is an integer number (38742913300).

Almost surely, 2^{1220103121221} is an apocalyptic number.

It is an amenable number.

1220103121221 is a deficient number, since it is larger than the sum of its proper divisors (639556717179).

1220103121221 is a wasteful number, since it uses less digits than its factorization.

1220103121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640418 (or 640415 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 1220103121221 its reverse (1221213010221), we get a palindrome (2441316131442).

The spelling of 1220103121221 in words is "one trillion, two hundred twenty billion, one hundred three million, one hundred twenty-one thousand, two hundred twenty-one".