120211011100021 has 4 divisors (see below), whose sum is σ = 120213233128044. Its totient is φ = 120208789072000.

The previous prime is 120211011100009. The next prime is 120211011100027. The reversal of 120211011100021 is 120001110112021.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 93641213031921 + 26569798068100 = 9676839^2 + 5154590^2 .

It is a cyclic number.

It is not a de Polignac number, because 120211011100021 - 2²⁷ = 120210876882293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 120211011099974 and 120211011100010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120211011100027) 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, 1110932860 + ... + 1111041061.

It is an arithmetic number, because the mean of its divisors is an integer number (30053308282011).

Almost surely, 2^{120211011100021} is an apocalyptic number.

It is an amenable number.

120211011100021 is a deficient number, since it is larger than the sum of its proper divisors (2222028023).

120211011100021 is an equidigital number, since it uses as much as digits as its factorization.

120211011100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2222028022.

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

Adding to 120211011100021 its reverse (120001110112021), we get a palindrome (240212121212042).

The spelling of 120211011100021 in words is "one hundred twenty trillion, two hundred eleven billion, eleven million, one hundred thousand, twenty-one".