1212121001001 has 32 divisors (see below), whose sum is σ = 1786317781248. Its totient is φ = 727199447040.

The previous prime is 1212121000999. The next prime is 1212121001011. The reversal of 1212121001001 is 1001001212121.

It is not a de Polignac number, because 1212121001001 - 2¹ = 1212121000999 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1212121001011) 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, 2872311 + ... + 3267171.

It is an arithmetic number, because the mean of its divisors is an integer number (55822430664).

Almost surely, 2^{1212121001001} is an apocalyptic number.

It is an amenable number.

1212121001001 is a deficient number, since it is larger than the sum of its proper divisors (574196780247).

1212121001001 is a wasteful number, since it uses less digits than its factorization.

1212121001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397521.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1212121001001 its reverse (1001001212121), we get a palindrome (2213122213122).

The spelling of 1212121001001 in words is "one trillion, two hundred twelve billion, one hundred twenty-one million, one thousand, one".