1211222221002 has 12 divisors (see below), whose sum is σ = 2624314812210. Its totient is φ = 403740740328.

The previous prime is 1211222220973. The next prime is 1211222221039. The reversal of 1211222221002 is 2001222221121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1080329493321 + 130892727681 = 1039389^2 + 361791^2 .

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: 67290123389 = 1211222221002 / (1 + 2 + 1 + 1 + 2 + 2 + 2 + 2 + 2 + 1 + 0 + 0 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33645061677 + ... + 33645061712.

Almost surely, 2^{1211222221002} is an apocalyptic number.

1211222221002 is an abundant number, since it is smaller than the sum of its proper divisors (1413092591208).

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

1211222221002 is a wasteful number, since it uses less digits than its factorization.

1211222221002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67290123397 (or 67290123394 counting only the distinct ones).

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

Adding to 1211222221002 its reverse (2001222221121), we get a palindrome (3212444442123).

The spelling of 1211222221002 in words is "one trillion, two hundred eleven billion, two hundred twenty-two million, two hundred twenty-one thousand, two".