1202112211221 has 48 divisors (see below), whose sum is σ = 1869010219440. Its totient is φ = 741764136960.

The previous prime is 1202112211217. The next prime is 1202112211229. The reversal of 1202112211221 is 1221122112021.

1202112211221 is a `hidden beast` number, since 1 + 20 + 211 + 2 + 211 + 221 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 7878515121 + 1194233696100 = 88761^2 + 1092810^2 .

It is not a de Polignac number, because 1202112211221 - 2² = 1202112211217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1202112211194 and 1202112211203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1202112211229) 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, 77204125 + ... + 77219693.

It is an arithmetic number, because the mean of its divisors is an integer number (38937712905).

Almost surely, 2^{1202112211221} is an apocalyptic number.

It is an amenable number.

1202112211221 is a deficient number, since it is larger than the sum of its proper divisors (666898008219).

1202112211221 is a wasteful number, since it uses less digits than its factorization.

1202112211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23926 (or 23923 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1202112211221 its reverse (1221122112021), we get a palindrome (2423234323242).

The spelling of 1202112211221 in words is "one trillion, two hundred two billion, one hundred twelve million, two hundred eleven thousand, two hundred twenty-one".