1212210221042 has 16 divisors (see below), whose sum is σ = 1825599463512. Its totient is φ = 603681361920.

The previous prime is 1212210221041. The next prime is 1212210221087. The reversal of 1212210221042 is 2401220122121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 972414904321 + 239795316721 = 986111^2 + 489689^2 .

It is not an unprimeable number, because it can be changed into a prime (1212210221041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 508559 + ... + 1638002.

Almost surely, 2^{1212210221042} is an apocalyptic number.

1212210221042 is a deficient number, since it is larger than the sum of its proper divisors (613389242470).

1212210221042 is a wasteful number, since it uses less digits than its factorization.

1212210221042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2147693.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 1212210221042 its reverse (2401220122121), we get a palindrome (3613430343163).

The spelling of 1212210221042 in words is "one trillion, two hundred twelve billion, two hundred ten million, two hundred twenty-one thousand, forty-two".