1221201212202 has 64 divisors (see below), whose sum is σ = 2724497078400. Its totient is φ = 405460287360.

The previous prime is 1221201212201. The next prime is 1221201212219. The reversal of 1221201212202 is 2022121021221.

It is a happy number.

1221201212202 is a `hidden beast` number, since 1 + 221 + 201 + 21 + 220 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1221201212201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 95095302 + ... + 95108142.

It is an arithmetic number, because the mean of its divisors is an integer number (42570266850).

Almost surely, 2^{1221201212202} is an apocalyptic number.

1221201212202 is an abundant number, since it is smaller than the sum of its proper divisors (1503295866198).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221201212202 is a wasteful number, since it uses less digits than its factorization.

1221201212202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19668 (or 19662 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1221201212202 its reverse (2022121021221), we get a palindrome (3243322233423).

The spelling of 1221201212202 in words is "one trillion, two hundred twenty-one billion, two hundred one million, two hundred twelve thousand, two hundred two".