12021021111001 has 6 divisors (see below), whose sum is σ = 13983636802650. Its totient is φ = 10303732380816.

The previous prime is 12021021110993. The next prime is 12021021111013. The reversal of 12021021111001 is 10011112012021.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 7244436019401 + 4776585091600 = 2691549^2 + 2185540^2 .

It is not a de Polignac number, because 12021021111001 - 2³ = 12021021110993 is a prime.

It is a super-2 number, since 2×12021021111001² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12021021151001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 122663480676 + ... + 122663480773.

It is an arithmetic number, because the mean of its divisors is an integer number (2330606133775).

Almost surely, 2^{12021021111001} is an apocalyptic number.

It is an amenable number.

12021021111001 is a deficient number, since it is larger than the sum of its proper divisors (1962615691649).

12021021111001 is an equidigital number, since it uses as much as digits as its factorization.

12021021111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245326961463 (or 245326961456 counting only the distinct ones).

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

Adding to 12021021111001 its reverse (10011112012021), we get a palindrome (22032133123022).

The spelling of 12021021111001 in words is "twelve trillion, twenty-one billion, twenty-one million, one hundred eleven thousand, one".