1212221210202 has 12 divisors (see below), whose sum is σ = 2626479288810. Its totient is φ = 404073736728.

The previous prime is 1212221210201. The next prime is 1212221210203. The reversal of 1212221210202 is 2020121222121.

It is a happy number.

1212221210202 is a `hidden beast` number, since 1 + 212 + 221 + 210 + 20 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (1212221210201) and next prime (1212221210203).

It can be written as a sum of positive squares in only one way, i.e., 1025174475081 + 187046735121 = 1012509^2 + 432489^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 67345622789 = 1212221210202 / (1 + 2 + 1 + 2 + 2 + 2 + 1 + 2 + 1 + 0 + 2 + 0 + 2).

It is not an unprimeable number, because it can be changed into a prime (1212221210201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33672811377 + ... + 33672811412.

Almost surely, 2^{1212221210202} is an apocalyptic number.

1212221210202 is an abundant number, since it is smaller than the sum of its proper divisors (1414258078608).

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

1212221210202 is a wasteful number, since it uses less digits than its factorization.

1212221210202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67345622797 (or 67345622794 counting only the distinct ones).

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

Adding to 1212221210202 its reverse (2020121222121), we get a palindrome (3232342432323).

The spelling of 1212221210202 in words is "one trillion, two hundred twelve billion, two hundred twenty-one million, two hundred ten thousand, two hundred two".