1220222224121 has 4 divisors (see below), whose sum is σ = 1221825670644. Its totient is φ = 1218618777600.

The previous prime is 1220222224097. The next prime is 1220222224127. The reversal of 1220222224121 is 1214222220221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 327595969600 + 892626254521 = 572360^2 + 944789^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220222224121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220222224127) 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, 801722120 + ... + 801723641.

It is an arithmetic number, because the mean of its divisors is an integer number (305456417661).

Almost surely, 2^{1220222224121} is an apocalyptic number.

It is an amenable number.

1220222224121 is a deficient number, since it is larger than the sum of its proper divisors (1603446523).

1220222224121 is an equidigital number, since it uses as much as digits as its factorization.

1220222224121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1603446522.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 1220222224121 its reverse (1214222220221), we get a palindrome (2434444444342).

The spelling of 1220222224121 in words is "one trillion, two hundred twenty billion, two hundred twenty-two million, two hundred twenty-four thousand, one hundred twenty-one".