1121212121001 has 32 divisors (see below), whose sum is σ = 1782929940480. Its totient is φ = 612790711104.

The previous prime is 1121212120979. The next prime is 1121212121017. The reversal of 1121212121001 is 1001212121211.

It is a happy number.

It is not a de Polignac number, because 1121212121001 - 2⁵ = 1121212120969 is a prime.

It is a super-2 number, since 2×1121212121001² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1121212121041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6991351 + ... + 7149923.

It is an arithmetic number, because the mean of its divisors is an integer number (55716560640).

Almost surely, 2^{1121212121001} is an apocalyptic number.

It is an amenable number.

1121212121001 is a deficient number, since it is larger than the sum of its proper divisors (661717819479).

1121212121001 is a wasteful number, since it uses less digits than its factorization.

1121212121001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173245.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1121212121001 its reverse (1001212121211), we get a palindrome (2122424242212).

The spelling of 1121212121001 in words is "one trillion, one hundred twenty-one billion, two hundred twelve million, one hundred twenty-one thousand, one".