21120112121001 has 8 divisors (see below), whose sum is σ = 28173376440480. Its totient is φ = 14073461274432.

The previous prime is 21120112120973. The next prime is 21120112121021. The reversal of 21120112121001 is 10012121102112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21120112121001 - 2⁵ = 21120112120969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21120112121021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1653360775 + ... + 1653373548.

It is an arithmetic number, because the mean of its divisors is an integer number (3521672055060).

Almost surely, 2^{21120112121001} is an apocalyptic number.

It is an amenable number.

21120112121001 is a deficient number, since it is larger than the sum of its proper divisors (7053264319479).

21120112121001 is a wasteful number, since it uses less digits than its factorization.

21120112121001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3306736455.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21120112121001 its reverse (10012121102112), we get a palindrome (31132233223113).

The spelling of 21120112121001 in words is "twenty-one trillion, one hundred twenty billion, one hundred twelve million, one hundred twenty-one thousand, one".