12011001220021 has 4 divisors (see below), whose sum is σ = 12029680849312. Its totient is φ = 11992321590732.

The previous prime is 12011001219983. The next prime is 12011001220051. The reversal of 12011001220021 is 12002210011021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12011001220021 - 2²³ = 12010992831413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12011001219983 and 12011001220010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011001220051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9339813681 + ... + 9339814966.

It is an arithmetic number, because the mean of its divisors is an integer number (3007420212328).

Almost surely, 2^{12011001220021} is an apocalyptic number.

It is an amenable number.

12011001220021 is a deficient number, since it is larger than the sum of its proper divisors (18679629291).

12011001220021 is an equidigital number, since it uses as much as digits as its factorization.

12011001220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18679629290.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12011001220021 its reverse (12002210011021), we get a palindrome (24013211231042).

The spelling of 12011001220021 in words is "twelve trillion, eleven billion, one million, two hundred twenty thousand, twenty-one".