1212121001 has 8 divisors (see below), whose sum is σ = 1491841344. Its totient is φ = 959040720.

The previous prime is 1212120991. The next prime is 1212121037. The reversal of 1212121001 is 1001212121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1212121001 - 2¹⁰ = 1212119977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1212121051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6659915 + ... + 6660096.

It is an arithmetic number, because the mean of its divisors is an integer number (186480168).

Almost surely, 2^1212121001 is an apocalyptic number.

It is an amenable number.

1212121001 is a deficient number, since it is larger than the sum of its proper divisors (279720343).

1212121001 is a wasteful number, since it uses less digits than its factorization.

1212121001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13320031.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1212121001 is about 34815.5281591419. The cubic root of 1212121001 is about 1066.2245023582.

Adding to 1212121001 its reverse (1001212121), we get a palindrome (2213333122).

The spelling of 1212121001 in words is "one billion, two hundred twelve million, one hundred twenty-one thousand, one".