1212021111001 has 16 divisors (see below), whose sum is σ = 1234521699840. Its totient is φ = 1189607281920.

The previous prime is 1212021110987. The next prime is 1212021111013. The reversal of 1212021111001 is 1001111202121.

It is a happy number.

It is not a de Polignac number, because 1212021111001 - 2⁵ = 1212021110969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212021111101) 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 15 ways as a sum of consecutive naturals, for example, 98348226 + ... + 98360548.

It is an arithmetic number, because the mean of its divisors is an integer number (77157606240).

Almost surely, 2^{1212021111001} is an apocalyptic number.

It is an amenable number.

1212021111001 is a deficient number, since it is larger than the sum of its proper divisors (22500588839).

1212021111001 is a wasteful number, since it uses less digits than its factorization.

1212021111001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15696.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1212021111001 its reverse (1001111202121), we get a palindrome (2213132313122).

The spelling of 1212021111001 in words is "one trillion, two hundred twelve billion, twenty-one million, one hundred eleven thousand, one".