21000011021201 has 16 divisors (see below), whose sum is σ = 23065954813440. Its totient is φ = 19038565777920.

The previous prime is 21000011021053. The next prime is 21000011021203. The reversal of 21000011021201 is 10212011000012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21000011021201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000011021203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 190635701 + ... + 190745826.

It is an arithmetic number, because the mean of its divisors is an integer number (1441622175840).

Almost surely, 2^{21000011021201} is an apocalyptic number.

It is an amenable number.

21000011021201 is a deficient number, since it is larger than the sum of its proper divisors (2065943792239).

21000011021201 is a wasteful number, since it uses less digits than its factorization.

21000011021201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381381664.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21000011021201 its reverse (10212011000012), we get a palindrome (31212022021213).

The spelling of 21000011021201 in words is "twenty-one trillion, eleven million, twenty-one thousand, two hundred one".