21021200112001 has 8 divisors (see below), whose sum is σ = 21458272785984. Its totient is φ = 20587754597520.

The previous prime is 21021200111981. The next prime is 21021200112041. The reversal of 21021200112001 is 10021100212012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21021200112001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021200112041) 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 7 ways as a sum of consecutive naturals, for example, 906778165 + ... + 906801346.

It is an arithmetic number, because the mean of its divisors is an integer number (2682284098248).

Almost surely, 2^{21021200112001} is an apocalyptic number.

It is an amenable number.

21021200112001 is a deficient number, since it is larger than the sum of its proper divisors (437072673983).

21021200112001 is a wasteful number, since it uses less digits than its factorization.

21021200112001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1813579751.

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

Adding to 21021200112001 its reverse (10021100212012), we get a palindrome (31042300324013).

The spelling of 21021200112001 in words is "twenty-one trillion, twenty-one billion, two hundred million, one hundred twelve thousand, one".