2121201110021 has 4 divisors (see below), whose sum is σ = 2424229840032. Its totient is φ = 1818172380012.

The previous prime is 2121201109981. The next prime is 2121201110051. The reversal of 2121201110021 is 1200111021212.

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 2121201110021 - 2³⁴ = 2104021240837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121201109978 and 2121201110005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121201110051) 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 3 ways as a sum of consecutive naturals, for example, 151514364995 + ... + 151514365008.

It is an arithmetic number, because the mean of its divisors is an integer number (606057460008).

Almost surely, 2^{2121201110021} is an apocalyptic number.

It is an amenable number.

2121201110021 is a deficient number, since it is larger than the sum of its proper divisors (303028730011).

2121201110021 is an equidigital number, since it uses as much as digits as its factorization.

2121201110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303028730010.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 2121201110021 its reverse (1200111021212), we get a palindrome (3321312131233).

The spelling of 2121201110021 in words is "two trillion, one hundred twenty-one billion, two hundred one million, one hundred ten thousand, twenty-one".