21120021112001 has 8 divisors (see below), whose sum is σ = 24969483088320. Its totient is φ = 17478638161488.

The previous prime is 21120021111997. The next prime is 21120021112009. The reversal of 21120021112001 is 10021112002112.

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

It is not a de Polignac number, because 21120021112001 - 2² = 21120021111997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120021112009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52019756231 + ... + 52019756636.

It is an arithmetic number, because the mean of its divisors is an integer number (3121185386040).

Almost surely, 2^{21120021112001} is an apocalyptic number.

It is an amenable number.

21120021112001 is a deficient number, since it is larger than the sum of its proper divisors (3849461976319).

21120021112001 is a wasteful number, since it uses less digits than its factorization.

21120021112001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104039512903.

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

Adding to 21120021112001 its reverse (10021112002112), we get a palindrome (31141133114113).

The spelling of 21120021112001 in words is "twenty-one trillion, one hundred twenty billion, twenty-one million, one hundred twelve thousand, one".