1211212121012 has 6 divisors (see below), whose sum is σ = 2119621211778. Its totient is φ = 605606060504.

The previous prime is 1211212120969. The next prime is 1211212121023. The reversal of 1211212121012 is 2101212121121.

It can be written as a sum of positive squares in only one way, i.e., 874909553956 + 336302567056 = 935366^2 + 579916^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 151401515123 + ... + 151401515130.

It is an arithmetic number, because the mean of its divisors is an integer number (353270201963).

Almost surely, 2^{1211212121012} is an apocalyptic number.

It is an amenable number.

1211212121012 is a deficient number, since it is larger than the sum of its proper divisors (908409090766).

1211212121012 is a wasteful number, since it uses less digits than its factorization.

1211212121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302803030257 (or 302803030255 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1211212121012 its reverse (2101212121121), we get a palindrome (3312424242133).

The spelling of 1211212121012 in words is "one trillion, two hundred eleven billion, two hundred twelve million, one hundred twenty-one thousand, twelve".